The AeroCal 7750i is a laboratory ADTS for calibrating a wide variety of avionics instrumentation such as altimeters, airspeed indicators, rate of climb meters,Mach meters, air data computers and engine-based control systems that rely on accurate control and measurement of pressure. The AeroCal 7750i can be used to calibrate devices that are required to meet the Reduced Vertical Separation Minimal (RVSM) requirements, controlling altitude to within two feet(better than 0.003 in Hg) at sea level. Additionally, the AeroCal 7750i provides precision rate control for both altitude and airspeed.