Pressure accurate to ±1 is registered on the gauge, and locked in by means of a check-valve thumb screw
Thumb screw can then be used to relieve the pressure, in order to check range span by stopping at precise points on the gauge
Consists of a sphygomanometer type (blood pressure) precision gauge with a squeeze bulb for applying pressure manually and a precision-machined hand-adjusted valve to hold and relieve the calibrating pressure
Flexible hose and a 3/16″ tube – 1/2″ NPT compression fitting is supplied for quick and easy connection to unit being tested
Calibrator weighs only 8 oz. as compared to 3 or more pounds for equipment marketed in kit form or one made up by the technician from parts