Typically there is an imperial and a metric fixed scale; either one will work.Log in Sign up Terms of Use We use cookies to make wikiHow great.To create this article, 11 people, some anonymous, worked to edit and improve it over time.Besides digital models, which uses an electronic screen, a caliper can display the measurement on a pair of scales (vernier caliper) or on a scale and dial gauge (dial caliper).
Use the instructions for vernier calipers if your tool has two scales, one sliding over the other. If your tool has one scale and a round dial instead, see the dial caliper instructions instead. Before you take the measurement, close the larger jaws completely and press the Zero, Tare or ABS button to set the closed position to a value of zero. Loosen the screw or screws holding the sliding scale in place. Compare the 0 positions on the sliding scale and the fixed scale, which is engraved on the caliper body. If the two 0 marks are lined up exactly, skip ahead to reading the measurement. While this is not common, some vernier calipers have an adjustment wheel on the sliding scale, which can be pushed to adjust the sliding scale without affecting the caliper jaws. If your model has this wheel, push it until the zeroes on the sliding scale and fixed scale line up, then skip ahead to reading the measurement. If the sliding scales 0 is to the right of the fixed scales 0, read the measurement on the fixed scale that lines up with the sliding scales 0. This is a positive zero error, so write this down with a sign. If the sliding scales 0 is to the left of the fixed scales 0, take the following steps. Repeat until the sliding scale 0 is to the right of the fixed scale 0. Move the sliding scale until it is further right than the fixed scale, then line up the 7 with the next fixed-scale mark: 7mm. The sliding scales 0 is now located at the 0.7mm mark. Any time you take a measurement, subtract your zero error from the result to get the actual dimensions of the object. Dont forget to take the sign of the zero error ( or -) into account. Clamp the large, flat jaws around an object to measure an outside dimension. Insert the smaller, curved jaws into an object and expand them outward to measure the interior dimension. If your caliper has a fine adjustment screw, you can use this to make more precise adjustments. Once you have the caliper jaws in the right position, look at the fixed scale, engraved onto the body of the caliper.
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