Do scale weights fall under the category of measuring instruments subject to mandatory calibration?

Yes, scale weights are metering instruments subject to mandatory verification. According to the Metrology Law, as a measuring instrument, load scales need to be calibrated regularly. Normally, weighbridges must be calibrated annually by a metrology bureau or a third-party organization to ensure the accuracy and reliability of their measurement results. .

Whether a scale requires annual inspection by a third party depends on local laws and regulations. Generally, a weighbridge is a device used to measure and record the weight of vehicles. If the place where it is used serves commercial or trading purposes, such as logistics companies, mines, ports, etc., then regular third-party annual inspections are usually required in accordance with local laws and regulations. Third-party annual inspections are carried out by agencies or individuals with the necessary qualifications and experience; they conduct tests, calibrations, and inspections of weigh scales in accordance with specified standards and technical requirements to ensure their accuracy and reliability. The frequency of annual inspections is usually once a year, but it may vary depending on local laws and regulations. If the location where the scale is used is for non-commercial or non-trade purposes, such as private parking lots or factories, then a third-party annual inspection may not be required; the specific requirements depend on local laws and regulations. In short, if the location where the scale is used is for commercial or trading purposes, it is recommended to consult the local relevant departments or agencies to find out whether an annual inspection by a third party is required, in order to ensure the accuracy and reliability of the scale.

Generally, it is required; the Market Supervision Bureau will also conduct inspections, and the metrology institute provides free testing services.

“Catalogue of Working Measuring Instruments Subject to Compulsory Verification in the People’s Republic of China”. For items listed in this catalog that are used for trade settlement, safety protection, medical and health care, or environmental monitoring, mandatory verification is required. The specific items are: 1. Rulers: bamboo and wooden rulers, sleeve rulers, steel tape measures, steel tape measures with hammers, railway gauge rulers ； 　2. Area meter: Leather area meter ； 　3. Glass liquid thermometer: Glass liquid thermometer ； 　　4. Thermometer: Thermometer 　　5. Petroleum flash point thermometer: Petroleum flash point thermometer ； 　　6. Grain moisture meter: Grain moisture measuring device ； 　　7. Calorimeter: Calorimeter ； 　　8. Weights: weights, chain weights, lead additions, fixed-amount lead ； 　　9. Balance: Balance ； 　　10. Scales: beam scales, small weighing scales, table scales, platform scales, floor scales, belt scales, hanging scales, electronic scales, luggage scales, postal scales, scales specifically used for pricing and charging, grain vending machines ； 　　11. Dosaging packaging machine: Dosaging packaging machine, dosaging filling machine ； 　　12. Track scale: Track scale ； 　　13. Grain density meter: Instrument for measuring the density of grains ； 　　14. Metering tanks, metering tank trucks: vertical metering tanks, horizontal metering tanks, spherical metering tanks, road-based metering tank trucks, rail-based metering tank trucks, ship-based metering tanks ； 　　15. Fuel filler: Fuel gauge ； 　　16. Increase in liquid volume: Increase of liquid amount ； 　　17. Edible oil dispenser: Edible oil dispenser ； 　　18. Alcohol meter: Alcohol meter ； 　　19. Density meter: Density meter ； 　　20. Sugar meter: Sugar meter ； 　　21. Milk Record: Milk Record ； 　　22. Gas meter: Gas meter ； 　　23. Water meter: Water meter ； 　　24. Flow meters: liquid flow meters, gas flow meters, steam flow meters ； 　　25. Pressure gauges: pressure gauges, air pressure gauges, oxygen gauges ； 　　26. Sphygmomanometer: Sphygmomanometers, blood pressure monitors ； 　　27. Tonometer: Tonometer ； 　　28. Car odometer: Car mileage meter ； 　　29. Taxi mileage meter: Taxi mileage meter ； 　　30. Speedometer: Highway management speed monitoring device ； 　　31. Vibration meter: Device for monitoring vibrations ； 　　32. Meters: single-phase meters, three-phase meters, time-of-use meters ； 　　33. Measurement transformers: current transformers, voltage transformers ； 　　34. Insulation resistance and ground resistance meters: Insulation resistance meters, ground resistance meters ； 　　35. Field strength meter: Field strength meter ； 　　36. ECG, EEG machines: ECG machines, EEG machines ； 　　37. Dosimeters (including medical radiation sources): Dosimeters, medical radiation sources ； 　　38. Ionizing radiation protection instruments: radiation monitors, dose rate meters, radioactive surface contamination detectors, personal dosimeters ； 　　39. Activity meter: Activity meter ； 　　40. Laser energy, power meters (including medical laser sources): Laser energy meters, laser power meters, medical laser sources ； 　　41. Ultrasonic power meter (including medical ultrasonic source): Ultrasonic power meter, medical ultrasonic source ； 　　42. Sound level meter: Sound level meter ； 　　43. Audiometer: Audiometer ； 　　44. Hazardous gas analyzers: CO analyzer, CO2 analyzer, SO2 analyzer, hydrogen detector, hydrogen sulfide detector ； 45. pH meter: pH meter, blood gas acid-base balance analyzer ； 　　46. Gas meter: gas alarm, gas detector ； 　　47. Mercury detector: Mercury vapor analyzer ； 　　48. Flame photometer: Optical flame photometer ； 　　49. Spectrophotometers: visible light spectrophotometers, ultraviolet spectrophotometers, infrared spectrophotometers, fluorescence spectrophotometers, atomic absorption spectrophotometers ； 　　50. Colorimeter: Filtered photometric colorimeter, fluorescent photometric colorimeter ； 　　51. Smoke and dust measuring instruments: Smoke measuring instrument, Dust measuring instrument ； 　　52. Water quality pollution monitors: water quality monitors, comprehensive water quality analyzers, cyanide detectors, bath oxygen meters ； 　　53. Exhaled breath alcohol detector: Exhaled breath alcohol content detector ； 　　54. Hemocytometer: Electronic hemocytometer ； 　　55. Refractometer: Refractometer.

It depends on the purpose; those used for trade settlements are subject to strict inspection

What constitutes trade settlement? At the factory entrance, tank trucks carrying purchased raw materials such as liquid alkali, nitric acid, and methanol arrive for weighing; does this fall under trade settlement?

Weighbridges are generally used for trade settlement

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