Such as for marking, tapping and prying parts, cleaning debris or waste liquid and other work, be sure to use special tools, and not for the sake of convenience, with the precision measuring tools at hand to operate. In addition, waving or rotating the precision measuring tool at will in the hand is also an incorrect operation behavior, which is easy to damage the accuracy of the measuring tool.
Precision measuring tools these conditions can not be repaired by themselves!
There are two important factors affecting the measuring result of the measuring tool