The PS-425 pitot-static tester from Preston Pressure uses manual pumps and a digital display, calibrated to 35,000 feet. Ideal for pitot-static tests and go-no-go checks. It is powered by 12 volts DC, either by internal batteries or a power adapter. Leak test timer. Annual calibration. For more information call (580) 286-3161 or visit www.prestonpressure.com.