Second, device after calibration of pressure gauge, to check the accuracy of the work pressure gauge.
二是装置经过校验的压力表，以便核对工作压力表的准确度。
2
The device can gauge the speed.
这种装置可以计量速度。
3
The three - meter checking device and hydraulic machine were developed to substitute the traditional three - legged divider plug gauge and correction by the thread rod.