Wash your hands before you handle the vernier caliper to remove dirt and oils that might damage the caliper. Wipe the caliper components clean both before and after you use the caliper. Do NOT drop or otherwise mishandle the caliper. Doing so may damage or destroy the caliper. Figure 2-4 shows the most common types of micrometers.
Most micrometers have a frame, anvil, spindle, sleeve, thimble, and ratchet stop.
There are other uses of micrometers, but those mentioned here are uses you are most likely to encounter. Common types of micrometers. Always stop the work before you take a measurement. DO NOT measure moving parts because the micrometer may get caught in the rotating work and be severely damaged. Always open a micrometer by holding the frame with one hand and turning the knurled sleeve with the other hand.