"Non-standard equipment" refers to non-standard equipment. It is not the equipment manufactured according to the unified industrial standards and specifications promulgated by the state, but the equipment designed and manufactured by itself according to its own use needs.Devices whose appearance or performance is not in the generic equipment product catalog.
Accuracy: the degree to which a test result, calculated value, or estimate is close to the truth value (or is considered to be true).
Repeatability: refers to the consistency of the results obtained by successive measurements of the same measurement under the same measurement conditions.
Reproducibility:precision between results measured by different analysts in different laboratories, called reproducibility.
Stability: the ability of a measuring instrument to keep its measurement characteristics constant over time.
Linearity: the degree of conformity of the calibration curve to the specified line.