The MECP500 Pneumatic Hand Pump is a compact, lightweight, portable, hand-operated pressure and vacuum pump. When a digital calibrator is added the unit can be used to calibrate or check presure measuring devices in the field. No external power or high pressure nitrogen bottles are required. The MECP500 is completely assembled and ready to connect to the pressure device to be calibrated. Calibration is quick and simple since the pump is taken directly to the pressure device. This pneumatic pump provides a source of air pressure, 0-500 psi (600 psi max.), or vacuum, 0-24″ Hg.