![]() Digital calipers in the automotive industry will read from 0 to 6-inches. The sizes that these rods come in will depend on the range that the digital caliper is capable of reading. Most professional digital calipers come with two or three calibration rods. ![]() Step 6 - Verify Digital Caliper Calibration With the moving and stationary contact pads making firm contact and firmly locked in place, rotate the knob or press the reset button until all digital readout digits are at 0. While keeping pressure against the moving pad, swivel the locking lever to lock the stationary pad in place. Press down on the movable portion of the locking fixed pad until it makes firm contact with the moving pad portion. Step 4 - Press Fixed Pad against Moving Pad and Lock Screw down on the adjustment knob until the moving portion of the digital caliper is as far as it will go. This needs to be unlocked in order to calibrate the digital caliper. On the fixed portion of the digital caliper is a locking lever that locks the fixed contact pad. Use a clean and lint free cloth to wipe off the contact pads. Having clean contact surfaces when measuring or calibrating to this degree of accuracy is imperative. Some calipers will measure to an accuracy of up to five decimal digits, or one hundred thousandth of an inch. Calipers are designed to measure to extreme degrees of accuracy.
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