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Measuring instruments shall be affixed on the logo indicates its status, with different colors identify its state, the state is divided into: Qualified, restrictions on the use, Precast concrete plant, demotion, scrapped. Qualified validity of measuring instruments shall be marked and numbered, and the remaining states should indicate the start of its state. Legible identification shall ensure that, if the wear measurement management personnel should be replaced. Measuring instruments should be created files, including certificate of verification of measuring instruments, factory certificate, use and maintenance records, manuals, etc. Ready mix concrete plant metering device measuring instruments used in various departments to check measuring instruments in use to grasp the quality of the case. When used or found during the inspection of measuring instruments misalignment, should immediately stop their use, according to the actual situation by the metering member debugging or ask legal metrology institutes debugging, testing, no person shall be dismantled or adjusted. Measuring instruments instruments and equipment maintenance, maintenance by the owners Zhu Xiaohong responsible.