According to the provisions of the Measurement Act of 87 years, the mandatory verification of measuring instruments in three categories, one is the public standard of measurement, the second is the department, the highest measurement standard of enterprises and institutions, the third is used for trade settlement, medical and health care, safety and security, environmental monitoring, and is included in the mandatory verification of measuring instruments catalog of measuring instruments for the work of measuring instruments. Three times published a detailed catalog, so far **** 60 117 kinds. In addition, the provinces have measurement regulations, and added a part, such as for forensic identification, engineering supervision, energy measurement, this depends on the specific circumstances of each province.
On the validation period, there is a one-time test, such as thermometers, only the first test, inaccurate scrapped; there are in accordance with the periodicity of the test, the validation period according to the provisions of the test protocols, half a year to four or five years ranging from the use of frequent, after the provincial level above the consent of the administrative department in charge of metrology, you can shorten the cycle.