http://www.longislandindicator.com/p11.html http://www.longislandindicator.com/p11.html > Before we start, let's state outright that the best, most reliable, a

http://www.longislandindicator.com/p11.html http://www.longislandindicator.com/p11.html > Before we start, let's state outright that the best, most reliable, and most useful caliper you can own is a vernier caliper. It isn't electronic and it doesn't have a dial ... Calipers should be frequently checked for accuracy using a gage block, or gage block combinations. To check for wear in the jaws do this: clean them and close them. Then hold them up to the light and if they're worn you'll see light shining through the gaps. At this point, measure with the unworn surfaces or have the calipers repaired. These jaws can be ground flat again.