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How to conduct annual inspection of fair scale?
Electronic weighbridge belongs to a kind of products in weighing instruments, and it is a compulsory product managed by the state. According to the provisions of the National Metrology Law, compulsory verification shall be carried out for the public standard measuring instruments, the highest standard measuring instruments used by departments, enterprises and institutions, and the working measuring instruments listed in the compulsory verification catalogue of trade settlement, safety protection, medical and health care and environmental monitoring. Those who fail to apply for verification according to regulations or fail to pass the verification shall not be used. Individuals and units using electronic weighing instruments must go to the local metrological department [the verification department authorized by the state] to confirm the newly purchased electronic weighing instruments for the first time, and can only use them after passing the verification, and then conduct annual inspection every year.

The maximum permissible error of electronic weighing instruments is determined by the national metrological verification regulation JJG539- 1997. Generally, it is 80 tons of weighbridge, with a scale value of 20 kg, and maximum permissible error is 60 kg.

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