This type of air pressure comparator is a light design that can generate both pressure and vacuum. It can be used to calibrate pressure-measuring instruments by comparing the readings between a reference instrument and the tested instrument.
Easy to operate
Air working media
The F-Adjust valve could accomplish 0.1mbar pressure resolution
The shut-off valve can staballize the calibration value
The improved design of reserve valve makes the switch of vacuum and positive pressure smoothly