Fluke 700HPPK-NPT High Pressure Pneumatic Pump/Comparator Kit  with NPT Fittings, 3000 psi - Fluke
Without requiring a nitrogen bottle or other external pressure supply the pneumatic pressures are generated and can be adjusted up to 21 MPa (3000 psi). While transmitters, controllers, pilots, digital and analog gauges, and other devices are under test (DUTs) it can supply pressure.