1. When there are burrs on the surface of the workpiece, the burrs must be removed before measurement, otherwise the measuring tool will be worn and the accuracy of measurement results will be affected.
2. Do not rub the measuring tool surface, measuring surface and cutting line with whetstone or emery cloth. Non-measuring maintenance personnel are strictly prohibited to disassemble, refit or repair the measuring tool without permission.
3. The measuring claw of the caliper shall not be used as a needle, compass or other tools, and shall not be manually twisted two claws or used as a gauge board.
4. Do not touch the measuring surface with your hand, because there will be sweat and other wet dirt on your hand, which will contaminate the measuring surface and cause it to rust. Do not put measuring tools with other tools or metal materials to avoid damage to measuring tools.