What is the verification method and content of hook scale

The verification of electronic crane scales shall be conducted in the following order according to the verification regulations of The National metrological verification regulation jJG539-1997 "Digital Indicating scales" of the People's Republic of China. (1) Appearance inspection According to the appearance requirements of the verification regulation of JJG539-1997 "Digital Indicator scale", the appearance inspection of the electronic crane scale shall be qualified if it meets the requirements, otherwise it will be unqualified. (2) Metrological performance verification Before metrological performance verification, the load should be preloaded to the maximum balance or maximum safety load. The verification content of electronic hook scale is as follows: 1. Appearance inspection 2. Zero check 3. Performance measurement 4. Rotation test 5. Discrimination test 6. Repeat tests 7. Overload test