Move the jaws exactly where you need them. The fine-adjustment wheel opens and closes the jaws in small, precise increments for extra control while measuring.

These classic calipers use a sliding vernier scale. Just add the measurement from the main scale to the measurement on the vernier scale to get accurate readings as small as 0.001". Made completely out of metal, they won't break when dropped or short-circuit when wet. They're battery-free, so they're always ready to use.