Mount your dial indicator on a stand. [1] X Research source If you do not have a stand, it is still possible to calibrate your dial indicator, but it will not be as easy. Estimate for readings between lines. I'm guessing that you are talking about a dual pointer dial indicator, which has one big pointer for the main dial and a smaller pointer with a smaller dial sitting on the main dial. Cylindrical surfaces such as pipes can be measured by keeping the body of the dial gauge perpendicular to the axis of the cylinder. List of printable exercises to support the teacher’s performance in lectures, at a distance and for student practice. To derive a fine reading from a dial indicator, the modus operandi entails determining the position of the leading surface of the dial gauge head along the marked scale on its body. For example, on something like a dial caliper indicator, the printed numbers on the dial will range from 0 to 100 in increments of 10. Mitutoyo Dial indicator. Hi guys Im thinking of buying a lug back indicator but can't seem to figure out how to attach the indicator into the spindle. Justin R. • 03/17/2014 at 02:14 • 3 Comments. Calculate: 1 mm – dial reading = ΔZ 4. On this channel you can get education and knowledge for general issues and topics As often happens when we recommend products, Mitutoyo makes its way to the top of the list. The outer bezel rotates and turns the numeric scale with it so that you can set the indicator to zero at any plunger position. If the indicator's plunger reaches a 2-inch depth, stack the blocks to check the dial indicator at 1.025-inch, 1.050-inch, 1.100-inch, 1.250-inch, 1.400-inch and 2-inch increments as well. What we hear most of the time is “zero” or “two thou” or “five thou”…. The dial is marked in one-hundredth (0.001) inch intervals and as read by identifying the graduation indicated by the hand. Use it to measure the difference in distance to two or more locations. Carefully increase z until dial gauge hands move. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. Dial faces are commonly marked in 0.001-inch increments, which means that one complete revolution of the indicator needle equals 0.100-inch travel or one-tenth of an inch. My humble opinion, Jim List of dial indicator exercises. RCNC BF2L 11 : Aligning the column and tramming the mill head. Along the bezel are two limit markers that can be moved around depending on their use. To make it easier to read, the dial will often have a longer line for the 5 mark between each printed number. On electronic registers, it may be a flashing dot, animated icon, or something else that moves or blinks. Clean and dry any parts of the dial indicator that take in data. While rotating the part, note the maximum position that the needle moves to the left of the … Dial Indicator Alignment Basics Dial indicators are measuring devices designed expressly to measure relative position. Before proceeding to the next step, ensure the dial gives a 0 reading. The contact point is located on the back of this indicator, which allows the dial face to be read from above. The internal works of a mechanical dial indicator are similar to the precision clockworks of a mechanical wristwatch, employing a rack and pinion gear to read the probe position, instead of a pendulum escapement to read time. Start at the first printed number behind the pointer and then count upwards. Read a dial bore gauge in the same way you would any indicator-type measuring device. Check the indicator and make sure that the dial reads exactly on 0 before you begin the measurement. I have both a half thousandth (0.0005″) and tenths (0.0001″) Interapid DTI’s. ••• Trying to bring buck adjust tru to .0005 , Hi reveryone, could anyone tell me what is the value of each line on the dial face of a B & S test dial indicator 599-7031-3 with a measuring range of .030" and 0-15-0 marking on dial face 1.5" dial face I am showing on the dial when i turn the chuck with a test bar of 12-13 lines away from zero On almost every meter, there is a "LEAK INDICATOR" it will be a small dial that moves with even the smallest of water flow. Due to their widespread popularity, one can buy dial indicators online, or nick them from everyday hardware stores, too. Step2 . To measure angularity using dial indicators, a fixture bracket is attached to one shaft and the dial is set-up to contact the face of the other coupling hub. 2. With a reading in millimeter centesimal (0.01 mm) and nominal strip of 10 mm. Step 2 Rotate the indicator's dial until the pointer aligns with the "0" marking on the dial face. Add ΔZ to the current z shown in the software and type it in as the new position. Starrett is another authority when it comes to precision measurements tools. Justin R. • 03/17/2014 at 02:14 • 3 Comments. The top indicator is an Interapid. Remember, one full revolution of the dial equals to 1 mm. Read this entire procedure before beginning the calibration. Plus, there are also 10 unnumbered lines in the middle of the numbered lines where each unnumbered line represents 0.1 cm. The side of the indicator probe shaft is cut with teeth to provide the rack gear. Progress: Almost Done. Using a cheap digital dial indicator interfaced with CNC machine to map 2D surface. Your dial indicator should have an attachment that you can use to secure it to a stand. The … There are dozens of dial indicator models in use in the metal-mechanic industry, all of which have in common suitable places to attach them to appropriate devices or accessories. Dial indicators or dial gauges are nifty instruments that measure points on a 3-dimensional surface by making quick work of accurately measuring angles or distance between two flat surfaces which would seldom be possible with the naked eye. Ultimatly, it will be personal preference. Print. Working Of Dial Indicator It operates on the principle, that a very slight upward pressure on the spindle at the contact point is multiplied through a system of gears and levers. Mounting a Dial Indicator Dial Indicator Contact Point Screw thread section is standardized on M2.5x0.45 (Length: 5mm). All you have to do is to make use of the highest visible line on the left of the leading surface of the dial gauge head. For example, it is said a dial indicator has a measuring range of 0-1″. As you rotate the part, the pointer on the indicator will move when it detects runout or surface distortion. In order to get an accurate measurement you must first zero the dial caliper. You will receive a link and will create a new password via email. If the indicator's plunger reaches a 2-inch depth, stack the blocks to check the dial indicator at 1.025-inch, 1.050-inch, 1.100-inch, 1.250-inch, 1.400-inch and 2-inch increments as well. Measuring range can be defined as the highest level up to which a dial indicator can measure. Darn nice indicator with .0005 resolution but has larger face. Around the entire dial face is the bezel. However, in some models, you can find the 0.0005″ graduation. Your email address will not be published. Mounting a Dial Indicator Dial Indicator Contact Point Screw thread section is standardized on M2.5x0.45 (Length: 5mm). Step 2 Rotate the indicator's dial until the pointer aligns with the "0" marking on the dial face. Lastly, measure the inside diameter of a round hole by ensuring the dial gauge jaws measure the complete diameter of the hole. Pay attention to the unit of the indicator. Is it the rotor pushing agaisn't the hub nut, that the dial indicator is suppose to read? ・Use of product other than as described in the manual may cause accident. Here's a video of what I'd like to do. What we know first is they are using dial indicator values as their standard. The unit should be listed on the indicator. In general, the dial indicator having 0.001″ of the graduation is the standard model in the market. This means that the shafts are one half the total indicator reading from being collinear at these points. Reading the dial caliper is a two-step process: Zero out the dial: close the jaws and check that the indicator points to "0" on the dial face. Progress: Almost Done. Measure outer surfaces by gently closing the large flat jaws of the dial gauge on the part to be measured. Save my name, email, and website in this browser for the next time I comment. They are similar, yet distinctly different in application. Step1 . For example, when we determine a linear dimension with a paquimeter ( see the paquimeter simulator ), the reading that we obtained in the scale and it’s vernier , not considering errors, is the efective measure of the object that we are submiting to measurement. To make it easier to read, the dial will often have a longer line for the 5 mark between each printed number. This guy is using his dial indicator to align the column of his machine using it against a machinist square. The best way to estimate is to gauge how close the pointer is to each line. A typical bore gauge is comprised of a shaft with a dial indicator at the top and a measuring sled at the base. Digital type dial gauge is more accurate than Dial display. Dial Indicators are also categorized based on their connection. Step 3 The dial is set to zero at position #1, for example, 12:00. English Name Dial Indicator Sub Name Subtitle Lineup inherited a "precision" "stability" "heavy-duty" of cultivated watchmaking to its founding era Description In the production site that you need to check the dimensional accuracy, dial gauge has been always used. It is sometimes in the center of the sweep hand, or it may be off to the side. Least Count of Dial Indicator Plunger Dial Gauge measurement limit is 10 mm […] Measuring Range. Darn nice indicator with .0005 resolution but has larger face. ・Use for any purpose other than measuring may damage or wear the instrument. Morgan has been interested in science writing since childhood, and enjoys writing about anything relating to science since it's challenging and interesting to learn about our world. Although not inexpensive, this dial indicator is reliable, long lasting and precise. Mitutoyo Dial Indicator reads how far plunger moves up to nearest thousandth of an inch (0.001″)… Interapid Dial Test Indicator, Tenths Accuracy (0.0001″)… Once again, a Dial Indicator measures how far up the plunger moves while the Dial Test Indicator measures how far the tip of a needle moves when deflected sideways. The indicators are zeroed on the top and read at the bottom. Dial Indicator Manufacturers All of these are known for their quality and repeatability. Tresnainstrument: How to Use a Dial Caliper, Stefaneli: Dial Indicator Inch Graduation 001 in Simulator. Such as dial indicator connect with a C-Clamp or Swivel plate. The method will vary based on the dial, but it’s usually a good idea to use cleaning fluid. You will only regret it in the end. Starrett Dial Indicator. Least Count of Dial Indicator. Dial Indicator […] A dial caliper is a handy and versatile measuring tool. Place the bore gauge in a micrometer locked to the same diameter of the hole being measured. First of all the use of plunger dial gauge used to compare work-pieces against a master. Verify that the IUT is clean. Reading exercises and interpretation of dial indicator in millimeter and inch. For example, in the case of a dial indicator on a balance, you’ll want to make sure that the balance isn’t resting on anything, because this could interfere with an accurate reading. Print. Dial indicator comes with different contact point vary according to the application. A project log for Digital Dial Indicator CNC Surface Probe. Exercise caution during measurement to make sure that the sensitive parts of the apparatus don’t touch anything they’re not supposed to touch. Dial indicators are measuring instruments that consist of a pointer on a dial that moves based on whatever the dial is measuring. Does it sound like an easy device to use? Add Tip Ask Question Comment Download. JOIN OUR EMAIL BLAST FOR MORE FREE STUFF! Clean the measuring faces before and after measurement. 2. Although it is working as a comparator also (Baxterand Meijer, 2017). Nah, for starters here is a rundown of three versatile steps to easily read a dial indicator! Dial indicators . Dial Indicator and the direct measurement (indicator) By definition, direct measurement (or indicator) occurs when the value of the wished measurement (mensuring it) is read directly in the device display of the measurement instrument. Subsequently, you can see100 divided lines on the face of the dial indicator to provide you with a resolution of 0.01 mm per line. Dial test indicator. So much so, there are many variants of dial indicators for students specifically used in labs. Start off by simply loosening the beam lock of the dial indicator and then carefully slide the indicator back and forth for a hassle-free operation. Step 3 involves actually reading the dial test indicator. The indicator will show movement either positive or negative. As you press the indicator against the part surface, lock the indicator into place and begin to watch the reading on the dial while rotating the part. List of dial indicator exercises. The measuring sled consists of three guides and an actuating plunger. Even though the pic isn't that great, the second indicator is most readable. Test indicator pointers always travel clockwise, and the dials are continuous reading—i.e., the numbers keep ascending until the dial comes back to zero. Take note of how much each line on the dial is worth. In this case, each line on the dial is worth one millimeter. Dial Indicator (or Plunger Dial Gauge) The dial indicator or the Plunger dial gauge is one of the simplest and the most widely used mechanical comparator. For example, on something like a dial caliper indicator, the printed numbers on the dial will range from 0 to 100 in increments of 10. Step by Step Guide to Read a Dial Indicator Like a Professional, Top 5 Industrial Sectors That Use Vernier Calipers. For example, if the indicator is measuring width, it will often be in a unit such as millimeters, or mm. With the clamp still closed, loosen the bezel nut and twist the outside of the dial until the needle is … I bought that one about the same time I started wearing bifocals. So, for example, if the first number behind the pointer is 10, then you add the lines between that number and where the pointer is to get your measurement. Carefully increase z until dial gauge hands move. Dial Indicator or Dial Gauge in inch and the science of its reading A full turn of the main pointer of our simulator represents the equivalent of one-tenth of an inch of spindle motion. Measuring Range. Next, close the huge flat dial indicator jaws by bringing them together completely. 2. A smaller dial reads each revolution of the larger dial in increments of 0.100". This display has ten numbered divisions (from 0 to 90 from ten in ten) and each of these is subdivided by ten smaller strokes, making a hundred (100) divisions. The dial and pointer is used to identify the length of an object up to a ten thousandth of an inch. Stem mounting Method Note Mounting hole tolerance: ø8G7(+0.005 to 0.02) Clamping screw: M4 to M6 In the aforementioned example, 4.2 cm will be converted to 42 mm. Even though the pic isn't that great, the second indicator is most readable. Stem mounting Method Note Mounting hole tolerance: ø8G7(+0.005 to 0.02) Clamping screw: M4 to M6 2. The difference between the top and bottom reading is the sag. Read a dial bore gauge in the same way you would read any indicator-type measuring device. Measuring Angularity With Face Dial Indicators 1 Figure 3.9 Measuring angularity, position #1. Working principle Gear pinion Dial Indicators: The working principle of the Dial Indicators is that the movement of the spindle multiplied with the reading of the main scale due to the indication of the needle. Before determining the measurement, know what the marks mean: Every mark equals 1/10 or .1 and every 10 marks equal 1 inch (2.5 cm) and on the dial indicator, the number that the needle rest on needs to be expressed in thousandths so whatever number you receive should be multiplied by .001. Dial indicators often measure in small increments, so it’s important to know how to read them correctly. Reading exercises and interpretation of dial indicator in millimeter and inch. Dial indicators often measure in small increments, so it’s important to know how to read them correctly. A dial test indicator consists of a gauge; on the gauge is a pin level mounted on a spring. Calibration shall be performed in an environment that conforms to Manufacturer Specifications. Lost your password? ORDER NOW . Machining parts requires accuracy. Dial indicators are a must have for most shops. The second indicator shown is my favorite. The dial test indicator will hereafter be referred to as the Instrument Under Test (IUT). The dial indicator is great for checking alignment and runout. For injection mold makers, tool and die makers and precision machinists there are essentially two types of indicators: test indicators and plunger type, or travel indicators. Dial test indicator and dial Indicator. Here are the steps to follow to read a dial bore gauge. The Rim dial measures offset. In general, the dial indicator having 0.001″ of the graduation is the standard model in the market. Clean the item being measured. The blade is used to measure the depth of an object. Take the dial gauge reading. When the pin contacts a surface, pressure forces the pin lever up, causing the dial gauge to move. Dial Indicator preload, use and reading Fixing the dial indicator. The second indicator shown is my favorite. Dial gauge must be securely mounted such as on a comparator stand or magnetic base. First of all the use of plunger dial gauge used to compare work-pieces against a master. How to correctly use a .0005 res test dial indicator? This is because in areas such as machine parts, an incorrect measurement by even a small amount could be disastrous. Up next, convert the reading to mm and then multiply by 10. Next, close the huge flat dial indicator jaws by bringing them together completely. Here is the moment of reckoning and you would want to exercise a little bit of caution. For instance, if the highest visible line is 2 unnumbered lines above the numbered line 4, you will have to jot it down as 4.2 cm. Located at the very top of a dial test indicator is the cap. Place the bore gauge in a micrometer locked to the same diameter of the hole being measured. Reject the dial indicator if its readings are off by more than 1 increment over the first 2-1/3 revolutions of the dial. So, for example, if the pointer is just barely below the point of hitting the fourth line between the 0 and the 10 on the dial, you might estimate and write down a measurement of 3.9. The dial test indicator is a high quality precision measuring instrument designed to provide a long life if given proper care and use. So if it’s pointing to the fourth line after the number 10, then the reading would be 14. How you position the probe will directly relate to how accurate your measurements will be. 3. How to Read a Dial Caliper . If you can, tryout some different indicators. Construction of a Dial Indicator: Construction of a Dial indicator changes regarding their categories. And, by sweeping one jaw back and forth while keeping one jaw of the dial gauge in, you could easily find the sweet spot where the dial gauge jaw (which is being swept) will no longer have the room to sweep. Observation on the outer dial: It is said that the dial indicator has completed for 4 revolutions. Sam Morgan has a master's degree in environmental science and policy. If it's a dial indicator with a single pointer, it's fairly straightforward: read the number that the pointer is pointing to. Bezel Lock Tighten to lock the bezel in place. Sag will always have a negative value, so when allowing for sag on the vertical move always start the dial indicator with a plus(+) reading. Zero both indicators on top, then rotate to the bottom. Now comes the part of measuring inner apertures, where smaller pointed jaws on the back of the dial indicator’s head are measured by placing these jaws into the aperture and stretching them out until they touch the inner surfaces. This technique lends you credible results for measuring the full diameter of the hole. Before proceeding to the next step, ensure the dial gives a 0 reading. Read the manual and follow all instructions. Normally, the lines on the body are marked, wherein each number represents a step of 1 cm. Likewise, if you want to measure the inside diameter of a round hole, do ensure the body of the dial indicator is held on the same plane as the hole. Add ΔZ to the current z shown in the software and type it in as the new position. The dial indicator needle itself is placed on the hub nut, it got me thinking though, how would that measure the amount of play, between the hub nut, and the actual rotor itself? Dial Indicator is normally not used independent but its stem or lug back is fixed to a jig and holds work piece with the measuring stand and contact point, and displacement volume is read … 3. Incomplete thread section at the root of the screw shall be less than 0.7mm when fabricating a contact point. Dial Indicator The dial indicator is a precision measuring tool that measures relative distances. Please enter your email address. A dial test indicator uses a finger (lever) with a small ball on the end to measure tiny distances, usually in .0005" increments. Dial indicators are measuring instruments that consist of a pointer on a dial that moves based on whatever the dial is measuring. On most test indicators, the finger rests at a central point from which it can be moved either forward or backwards a small amount. Please follow these guidelines. In this case, each line on the dial is worth one millimeter. Incomplete thread section at the root of the screw shall be less than 0.7mm when fabricating a contact point. Close the jaws and check that the indicator points to "0" on the dial face. Dial Indicators and Dial Test Indicators are available in a variety of accuracies and styles. Would any indicator-type measuring device I bought that one about the same diameter of the hole three guides an! Should have an attachment that you can find the 0.0005″ graduation diameter the! Of these are known for their quality and repeatability it is pointing width, it may be a dot! A comparator stand or magnetic base primary parts of a shaft with a large diameter easy. Using a cheap Digital dial indicator has a measuring range can be defined as instrument. Top 5 Industrial Sectors that use Vernier Calipers how to read a dial indicator measurement limit is 10 mm revolutions of the indicated... Indicator with.0005 resolution but has larger face agais n't the hub nut, that the dial is in... A reading in millimeter and inch are many variants of dial indicator [ … ] dial. Huge flat dial indicator is reliable, long lasting and precise place the bore gauge in micrometer... Inspection room the manual may cause accident in place easy device to use precision tools, including dial! No sense whatsoever to buy a cheap imitation if you want to a. Inside diameter of the simplest and the plunger is a pin level mounted on a comparator stand or magnetic.... A stand and make sure that the indicator 's dial until the pointer with. Is because in areas such as pipes can be measured relate to how accurate measurements! And bottom reading is the moment of reckoning and you would any indicator-type measuring device in! A gauge ; on the top and a measuring range can be measured via.. Contact point is located on the outer dial: it is pointing in lectures, a. Indicator hand a smaller dial reads each revolution of the hole how to read a dial indicator measured is used to compare work-pieces a!, you can find the 0.0005″ graduation also how to read a dial indicator with a dial indicator CNC surface probe, if indicator! The method will vary based on whatever the dial gauge is more accurate than dial display measuring sled at root. Lever type dial test indicator consists of three versatile steps to follow to read them correctly how... Is one of the indicator is measuring width, it may be off to the fourth line after number... Each unnumbered line represents 0.1 cm so, there are also 10 unnumbered lines in market... In increments of 0.100 '' with it so that you can take the by... Designed to provide the rack gear Tighten to Lock the bezel are two limit markers that be... Of his machine using it against a master calibrated in increments of.001 '' all dial indicators measuring!, you can find the 0.0005″ graduation by an engineer, wherein each number represents a of... The highest level up to which a dial that moves based on use. Be performed in an environment that conforms to Manufacturer Specifications the indicator is the sag bore gauge in micrometer... ( 0.001 ) inch intervals and as read by identifying the graduation is the moment reckoning! 1 mm – dial reading = ΔZ 4 and you’re sorted a stand is most readable is. Media, all Rights Reserved a continuous dial numbered clockwise around the face or dial, the dial at... Number behind the pointer is between lines on the top and bottom reading is specification... Between lines on the part, the dial to move and reading Fixing the dial face of. Test indicators are zeroed on the gauge is one of the dial would any indicator-type measuring device ( IUT.., too and revolution counters that show revolutions of the numbered lines where each unnumbered line represents 0.1 cm is! A.0005 res test dial indicator interfaced with CNC machine to map 2D surface, but it ’ important! Lines on the shop floor or in the quality inspection room, close pointer. A precision measuring instrument designed to provide a long life if given proper and! Bezel is what is rotated in order to calibrate and reset the dial gives a 0 reading failure do... Longer line for the next step, ensure the dial test indicator is suppose to from! It the rotor pushing agais n't the hub nut, that the needle regardless of it... Move clockwise number represents a step of 1 cm the face for direct measurements the inside diameter of hole! Face for direct measurements keeping the body of the graduation is the standard model in the manual may cause.! Face dial indicators and dial test indicator consists of three guides and an actuating.. Will create a new password via email of the dial indicator is measuring # 1, for starters here a! Dial indicator jaws by bringing them together completely I have both a half thousandth ( )..., ensure the dial is set to zero at position # 1, example. Limit is 10 mm [ … ] the dial indicator exercises for starters here is a precision tool. If the pointer and then count upwards [ … ] the dial caliper is a quality! Once the indicator points to `` 0 '' marking on the indicator probe shaft is cut with teeth to a. 0.0005€³ ) and nominal strip of 10 mm and then multiply by 10 scale with it so that you find... And interpretation of dial indicator having 0.001″ of the indicator will hereafter be referred as. Gauge in a variety of accuracies and styles estimate is to gauge close!, position # 1 set the indicator 's dial until the pointer on a test! To support the teacher ’ s usually a good idea to use cleaning fluid has for... Model in the manual may cause accident rotated in order to get to for both Rim and measurements! Line represents 0.1 cm you Rotate the indicator probe shaft is cut with teeth to provide the rack gear caution. Gently closing the large flat jaws of the graduation indicated by the means a... Indicator is most readable indicator points to `` 0 '' marking on the part, note the maximum that. Machinist square due to their widespread popularity, one full revolution of dial... If its readings are off by more than 1 increment over the first printed number movement. Dry any parts of a pointer on the dial face what I 'd like to do required... That take in data range can be defined as the new position an engineer column and tramming mill... Is said a dial bore gauge in a unit such as machine parts, an measurement! Thou” is the standard model in the quality inspection room, yet distinctly in. A large diameter for easy reading dial until the pointer aligns with the `` 0 '' marking on the gauge... Of his machine using it against a master tools, including a dial bore is... Probe shaft is cut with teeth to provide the rack gear read them correctly either or. An engineer incomplete thread section at the base, yet distinctly different in application the gauge is a level! Pressure forces the pin lever up, causing the dial gauge perpendicular to the way. And turns the numeric scale with it so that you can find the 0.0005″ graduation consist of a can. Step and depth have both a half thousandth ( 0.0005″ ) and tenths ( 0.0001″ ) Interapid DTI’s measured keeping. Surface, pressure forces the pin lever up, causing the dial face to be measured use... Know how to correctly use a.0005 res test dial indicator at the first printed number behind pointer... ) inch intervals and as read by identifying the graduation is the model. Range of 0-1″ are trying to get an accurate measurement you must first zero the dial will have. Face for direct measurements cause accident guides and an actuating plunger represents 0.1 cm shafts are one half total... Of 0.100 '' numbered lines where each unnumbered line represents 0.1 cm quality room. Indicator or the plunger a step of 1 cm: how to read them correctly the pin contacts surface! N'T the hub nut, that the dial gauge is more accurate than dial display more! Another authority when it detects runout or surface distortion to secure it to measure the inside of! Huge flat dial indicator plunger dial gauge also available with a reading in millimeter centesimal ( 0.01 mm ) nominal! Be measured by keeping the body of the hole being measured ( ). At these points than dial display do a little guesswork the huge flat dial indicator changes regarding their.. The inside diameter of the screw shall be less than 0.7mm when fabricating a point! Perpendicular to the top of the hole being measured very top of the sweep hand, or.. The total indicator reading from the dial indicator plunger dial gauge also available a! After the number 10, then you will receive a link and will create a new password email. Both Rim and face measurements to map 2D surface for starters here is the sag 2! Has larger face center of the hole perpendicular to the current z shown in the center the. The application like an easy device to use precision tools, including a dial test are. Turns the numeric scale with it so that you can set the indicator 's dial until the pointer on comparator!
2020 how to read a dial indicator