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 operated manually which moves the pistons back and forth leading to the formation of suction and deliver fluid used to pressure generation.