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
Precision and stability of gauge recording apparatus has relation with being successful or not of the well testing.
压力计记录装置的精度及稳定性直接关系到地层测试的成功与否。
3
For improving automatic gauge control precision and quality of the whole strip, FMN is proposed to correct gap of the rolling by fast hydraulic pressure system.