Operating Steps for Using a Vernier Caliper
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The operating steps for using a vernier caliper are as follows: 1. Put on gloves and take out the vernier caliper, wipe the oil off the surface of the ruler with a cloth (to prevent the ruler from rusting), close it, and check whether the zero scale lines of the vernier and the main ruler are aligned. If they are aligned, measurement can be performed; if not, record the zero error. 2. During measurement, hold the ruler body with your right hand, move the vernier with your thumb, hold the object to be measured (external or internal diameter) with your left hand, and place the object between the external measuring jaws. When it fits tightly with the jaws, you can read the measurement (make sure both arms are close to the object). 3. When reading, first use the zero scale line of the vernier as a reference to read the millimeter integer on the ruler body.