Mitutoyo Test Indicator & Dial Indicator Calibrator
Dial indicators and test indicators can be calibrated quite accurately using nothing but an indicator stand and a couple of gage blocks. If you have many of these in your shop, you'll save a great deal of time and frustration by investing in the UDT-2 dial gage tester made by Mitutoyo.
Although designed for use with Mitutoyo indicators, this calibration apparatus will work with any other brand of indicator. The indicator is mounted using the stem or the dovetail as the situation warrants.
In effect, it's nothing more than a sturdy stand with an oversized micrometer head and a bunch of fixtures to hold your indicators.
You will be limited to a 1" range so you'll still have to use gage blocks for any long range indicators you might have. Furthermore—and quite significantly—this kind of mechanical calibrator has .0001" graduations and only has an accuracy of ±.0001" (or ± 1µm in the metric version). This means you will be limited to the calibration of .001" and .0005" indicators. "Tenths" indicators may require a careful gage block set-up or electronic calibration. But, that's another story.
You will also be limited to either inch or metric. If you use both systems, then you would have to buy two separate calibrators.
Bore gages can also be calibrated (keeping the accuracy limitations in mind) if you purchase the optional gage stand adapter. This adapter is specifically made for Mitutoyo bore gages however, and may not work with other brands.
These items are often not in stock. You will want to allow up to several months for delivery.
Q: My bore gage range is larger than 1". Will I be able to use this calibrator?
Q: Won't my indicator calibrator eventually need to be calibrated as well?