The precision of liquid column manometer was described. The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed.
叙述了液柱式压力计的精度，对U形管压力计和双管差压计的正确使用方法及误差修正做了简要分析。
2
In this paper was introduced the factors of Influencing technical performance index of piston manometer, and analyzed the calibration and test ways of it and the measures of improving test precision.