Dial Thickness Gage dial thickness micrometer  medor de espesores  Starrett pocket thickness gage
 Pocket sized digital thickness gage
 Mitutoyo dial thickness gage
 Mitutoyo dial thickness gage with 4.7" deep throat see page 209
 Thickness gage with blade anvils
 Teclock dial thickness gage
 Kafer (Käfer) dial thickness gage
 dial thickness gage with 8" deep throat see page 168
 dial thickness gage with 16" deep throat see page 134
 Kafer dial thickness gage with large anvils for soft materials see page 118
 Pipe and tubular thickness
 digital fabric thickness gauge see page 158
 Mitutoyo digital thickness gage with SPC output see page 48
 Information about Newtons on page 10
 dial thickness gage with interchangeable anvils see page 216
Quick and easy measurements of small parts and thicknesses are made with these handheld tools. A choice of resolutions and physical dimensions is available from several manufacturers. The dial thickness gage is typically used to measure the thickness, in mils (.001"), of sheet metal, plastic, paper, and cardboard. Metric measurements (0.01 mm) are likely to be used for fabric thickness and numerous medical, botanical and biological applications. It's useful for measuring diameters of round and cylindrical objects, tubing and pipes. It will make quick work of determining the diameter of bolts, fishing line and guitar strings. Jewelers are likely to use it to measure the gage of gold wire. It has a lifting lever at the top which you depress with your thumb. The measuring surfaces (anvils) are flat and parallel. These are used for round or cylindrical objects. Thickness of flat sheets is better taken with at least one of the anvils rounded. Replacing the upper anvil with a round nylon contact point will eliminate some of the danger of damaging glass. Again, various manufacturers offer different models. Throat depth varies from a fraction of an inch to as much as 16 inches. This will determine how far the gage can be inserted onto the sheet or part being measured. Gages with large throat depths will require sturdier frames to eliminate distortion from weight. For larger throat depths, see Kafer on page 96. The pocket thickness gage is a miniature version, easily tucked away. These are available with an accuracy of ±.001" or ±0,01mm making them suitable for many applications. This has a lever which you need to slide in order to raise the anvil. A quick and easy to read digital version is available which offers both inch and metric readings. If you need the dimensions of larger items, use calipers instead. If you need greater resolution and accuracy you may want to use a micrometer. If you need to measure the thickness of coatings in mils or micrometers then use the Coating Thickness Gage available in several different styles (please call for information). The stated accuracy of the gage is more important than the dial graduations. Most digital instruments mislead with readouts to .00005" but offer accuracy of only ±.001". When shopping for a thickness gage ignore the graduations and focus on the accuracy instead. As with other gages, the inexpensive models are not repairable. They should be tossed and replaced when needed. Better quality gages are more likely to be repairable because spare parts will be available. You may wish to inquire whether a particular dial thickness gage is worth repairing before you send it to a repair shop. Measuring force is often an important factor when soft materials such as plastics and fabrics need to be measured. The measuring force will be listed in the manufacturer’s catalogs. In some cases, the manufacturer can modify the measuring force to your particular specifications, but this must be requested at the time of purchase and will undoubtedly result in longer delivery times. In the meterkilogramsecond system, the unit of force is the Newton (N), where 1 Newton = 100 gramforce = 0.225 poundforce. Other thickness applications include:
Starrett 245 Engineer's Combination Taper, Wire, And Thickness Gage
  Mitutoyo 7300S shown above This is the full sized version with guaranteed accuracy, including model 7326S with .0001" resolution. All these thickness micrometers have flat lower anvils (ø.433") and flat upper contact points (ø.394") made of ceramic for longer wear. A thumboperated lifting lever raises the indicator spindle. A full grip handle accommodates the other fingers of the hand. They are easy to use and the Mitutoyo models are almost always repairable. You can easily convert some of the newest models of Mitutoyo dial thickness gages to accommodate left handed use. Model 7300 shown above, for example can be converted. We'll do it for you, if requested at the time of purchse. Please inquire if this is possible for the gage you’d like to order. Please note that the letter S has been added to some models. This merely indicates that they are the most recent model made in Japan. These models are also available with a large 4.72" deep throat. (See page 209 for details.) Larger throat depths up to 16 inches are available from the reputable German manufacturer Käfer. Be sure to check for discounted online pricing often 2030% below list.
 Range  Throat Depth  Resolution  Accuracy  Order No.  P.O. Price  Internet Price         .05"  1.18"  .0001"  ±.0002"  7326S  220.00  check discount  .4"  1.18"  .001"  ±.001"  7300S  133.00  96.00 order now  1"  1.18"  .001"  ±.002"  7304S  160.00  check discount  1"  4.72"  .001"  ±.002"  7322S  188.00  check discount  10 mm  30 mm  0.01 mm  ±0.015 mm  7301  129.00  check discount  20 mm  30 mm  0.01 mm  ±0.025 mm  7305  154.00  check discount  20 mm  120 mm  0.01 mm  ±0.025 mm  7323  167.00  check discount  Measuring force for the gages above, where N=Newtons  7301 > 1.4 N
 7326S, 7300S > 1.5 N
 7304S, 7322S, 7305, 7323 > 2.0 N
  The following special models have a blade anvil and blade contact. The thickness of the blades are .039", the width is .256" and the height is .197" Model 7315 with blade anvils above  Range  Resolution  Throat Depth  Accuracy  Measuring force  Order no.  Price USD         10mm  0,01mm  1.18"  0,015mm  > 1.4 N  7315  stock / discount  .4"  .001"  1.18"  .001"  > 1.5 N  7316S  179.00          Pipe gages have a spherical anvil (ø.14") and a flat upper contact designed for measuring the thickness of a tubular wall. It can also be used by musicians to measure the graduated thickness of double reeds for oboes and bassoons. The anvil can be inserted into the tube for a distance of .78" See page 184 for details.   Known in some circles as a thickness micrometer, this Teclock thickness gage is frequently sold with the SPI, Fowler and other names on the dial. These fullsized thickness gages have a lifting lever on top allowing for easy, onehanded operation. The large dial diameter is 2.16" and the flat measuring face (anvil) .394" in diameter, is ceramic. See measuring force below. Made in Japan. Spare parts will not be available making repairs impossible. Teclock model SI112 shown above, with the SPI name on the dial. Some of these Teclock thickness gages are no longer available. The "Equivalent" column, below, will suggest suitable replacements found elsewhere on this page.
 Range  Throat Depth  Resolution  Measuring force  SPI No.  Model no.  Equivalent         .500"  1"  .001"  2.5 N  243600  SI112  check availability  1.000"  4.75"  .001"  3.5 N  243626  SI530  Mitutoyo 7322S  10 mm  26 mm  0.01 mm  2.5 N   SM112  Mitutoyo 7301  20 mm  30 mm  0.01 mm  3.5 N   SM528  Mitutoyo 7305          With the exception of model JZ15E, we no longer stock these Germanmade Kafer thickness gages. The information below is for reference only.
 Kafer no.  Range  Throat Depth  Resolution  Style  Accuracy  Sale Price*         JZ15  .400"  .700"  .001"  6 mm flat anvils  .0006"   JZ15C  .400"  .700"  .001"  10 mm flat anvils  .0006"   JZ45  .400"  1.77"  .001"  6 mm flat anvils  .0006"   JZ15D  .400"  .700"  .001"  3/8" Ø convex  **   JZ15E  .400"  .700"  .001"  spherical  **  190.00* order now  J15  10 mm  17 mm  0,01 mm  6 mm flat anvils  15µ   J15C  10 mm  17 mm  0,01 mm  10 mm flat anvils  15µ   J15E  10 mm  17 mm  0,01 mm  spherical  **   * Only one piece left in stock ** Accuracy on thickness gages with spherical anvils can not be verified in the closed position. It will be ±.0006" through the rest of its range. The force on these models of Kafer pocket thickness gages is approximately 0.7 N  Model J15 is equivalent to SPI 217901.
 Model J15C is equivalent to discontinued Mitutoyo 7309
 Model JZ15C is equivalent to discontinued Mitutoyo 7308
 Model J15E is equivalent to discontinued SPI 217927
 Model JZ15 is equivalent to SPI 207902.
 Model JZ15E is equivalent to discontinued SPI 207928.
 Model JZ15D is equivalent to SPI 207910
  Normally, contact points and anvils can not be replaced or interchanged on these gages. If they are flat surfaces, then they have been installed to lie parallel to each other. Replacing them removes any guarantee of accuracy. If you do not need 2 flat surfaces for measuring, then you have an option of several different contacts and anvils on Mitutoyo model 7328S thickness gage. Please refer to page 216 for details.
  For a flat sheet of paper, use a thickness gage which has flat anvils, top and bottom such as model 7309 shown on this page. Before you take a measurement, clean the anvils with a bit of alcohol, then place a piece of clean paper between the anvils, let them rest together under their own force, then pull the paper out slowly. This polishes and further cleans the surface. Now, with the paper removed, allow the gage to close. The hand (the pointer) will point to the twelve o'clock position, to zero. If the zero is slightly off, then you can rotate the bezel until the hand lines up with the zero, exactly. Now lift the anvil and repeat several times to make sure it always points to zero. This is called repeatability and should always be less than half a graduation. Now lift the anvil and insert the paper. Let the anvil close down on the paper and slide the anvils a little bit so you find the lowest reading on the dial. At first, the readings will fluctuate a few graduations because you may not be working parallel with the surface. You'll eventually find the right spot where the hand no longer fluctuates. Take this reading (one line = .001" in most gages). If the hand points to 31 then you have a thickness of 31 mils, or .031". If it points to 10 then the thickness is 10 mils or .010". Since the gage has an accuracy of ±.001" your reading is correctly stated as "10 mils plus or minus one mil." This, of course means that the actual thickness might be as little as 9 mils or as much as 11 mils. There is no way you can get around this fact. Now repeat the process with the same sample. Do this about 3 times to make sure you always get the same reading. If the readings are off, you're not holding or manipulating the gage correctly. One more thing: a "mil" is not the same as a millimeter (mm). They are entirely different dimensions. If your gage is metric, and the graduations are 0.01 mm, then every ten graduations will equal 0.10 mm. The same principles outlined above will apply.
  If the dial thickness gage has flat anvils, as most of them do, you will want to make sure they lie parallel when closed. Clean the anvils with alcohol as needed. The easy way to check this is to hold them up to a light and look for gaps. If there are no obvious gaps then set the dial to zero. At this point, insert a calibrated gage block between the anvils and check the dial reading several times. You should not be off by more than one graduation. If it is off, then make sure the block is lying flat and properly seated. Also make sure that the anvils—and the gage block—are very, very clean. It stands to reason that if the anvils are not parallel, you'll get a different reading on one side of the anvils. Use the gage block to test for this possibility. If your thickness gage has a relatively short range, then one or two different size gage blocks should suffice for calibration. Choose one for the middle range and one for the far range. Of course, if you only use the thickness gage for some specific measurement, then choose a gage block with approximately the same dimension.  For additional information on calibration see page 7.
 To order gage blocks see page 164.

 