1、 Preparation before use of tools and measuring tools:
(1) Before measuring, confirm whether the tools and measuring tools are zeroed.
(2) Check whether the measuring surface of the measuring tool is rusted, worn or scratched.
(3) First * * rough edges, oil stains or slag chips on the measuring surface of the workpiece.
(4) Wipe with a fine clean soft cloth or dust-free paper.
(5) The record book needs to be inspected regularly and corrected again if necessary.
(6) The measuring tools and instruments to be used shall be arranged in proper positions without overlapping.
(7) The vulnerable measuring tools shall be laid on the workbench with soft flannelette or soft wiping paper (such as optical flat mirror).
