What is the basis for the new purchase of tools that need to be tested for compulsory use?

Buy new tools, such as thermometer, pressure gauge, caliper ruler, etc., the factory certificate and certificate verification after the purchase, if you still need verification can be used? If compulsory testing is required, does it mean that the gage plant is not responsible for the accuracy of the gage? What are the specific rules for the verification of measuring tools at home and abroad, such as the validity period of verification?
2017-09-22 Reply
All the measuring instruments must meet the requirements, if it is mandatory to check, if not mandatory verification or calibration, can, whether mandatory directory and definition, you can check the compulsory verification, countries have not received verification costs. If it is not a compulsory measuring instrument and has a certificate of conformity or a certificate of the manufacturer, it may be confirmed instead of calibrated
2017-09-22 14:31:08 Put Back(1)
gr888 : sense
2017-09-22 Reply