气动量仪是长度计量仪器的一种。因它测量准确度高 ,应用范围广 ,而且对周围环境要求不高 ,所以经常在车间现场使用。量仪的指示部分是一根硬质玻璃管 ,它的全长为 310ｍｍ。管的内壁母线为二次曲线。浮标在玻璃管内升降的距离可从刻度尺上读出。在测量使用中 ,经常发生浮标卡 Pneumatic gauge is a kind of length measuring instrument. Because of its high measurement accuracy, wide range of applications, but also less demanding on the surrounding environment, it is often used in the workshop site. The indicator part of the gauge is a rigid glass tube with a total length of 310mm. The inner wall of the pipe is a quadratic curve. The distance the buoy moves up and down within the glass tube can be read out of the scale. Buoyancy cards often occur during measurements