Scale Calibration

What is scale calibration?
Calibration of a scale is a procedure in which a certified scale technician uses a known test weight certified by the State of North Carolina Bureau of Weights and Measures, to adjust the response of a mechanical or electronic weighing system to the following tests; The indicator must show zero when there is no weight on scale. When a known weight is applied the indicator must display the exact amount of applied weight within a specified tolerance. When weight is applied or removed incrementally the scale must display weight equal to that on the scale.