How to test pressure gauge movement?

Pressure gauge stopwatch with screw were locked on the connector, connecting rod and fan also by screw fastening connection, are conducted by rotational movement or mobile way of connecting rod of the instrument. Whereas the reverse movement is a movement of the upper plate riveted on the connector, then dial rivet on the machine core, connecting rod and movement fan tooth connection is riveting. Pressure gauge movement that is the most important in the pressure gauge, it consists of center gear, gear sector, balance spring, value adjustment screw, connecting rod, etc. Pressure gauge the quality of movement determines the precision accuracy of pressure gauge, stationarity of pointer. A good machine, hair must be neat, sector gear movement must be smooth, movement to smooth edges. Visual inspection: Visual) Light, no rust, no scratch, no distortion, the edge is not prick the hand. Hair neatly. Material is copper, each size shall conform to the requirements of the drawings. Pressure gauge movement spring tube can be free of the linear displacement to angular displacement, tiny displacement of spring tube amplifier, so that a pointer for the larger Angle of proportional to the measured pressure and to ensure that the pressure gauge has enough accuracy of reading, to achieve the purpose of easy observation indicated value.