Ace AI-DPI-2200, High Pressure Hand Pump Calibrator the pressure is generated by the hand operation of the caliper handle which moves a piston back and forth resulting in the suction and delivery fluid used for pressure generation. Suitable for use with water/oil. Applications: Calibration Labs, Field Calibration, Pressure Gauge Calibration, Pressure Transmitter Calibration. This is stoke and Extremaly efficient and have a needle valve provided controler pressure release and have comfortable , egronomically desinged molded handles with a built-in fine adjust vernierwith dual source of pneumatic pressure generation with a pressure of 600 psi and the vaccum to 28.5 in Hg it is operated manually which moves the pistons back and forth leading to the formation of suction and deliver fluid used to pressure generation.