Commercial airlines and the calibration laboratories that support them require highly accurate, laboratory-grade instruments capable of simulating a synchro or resolver. Across the globe, NAI's 5300 Synchro Resolver Standard is the overwhelming favorite of commercial airline manufacturers and their customers for calibrating Automatic Test Equipment (ATE), or highly accurate avionics sensors and equipment aboard commercial aircraft. The NAI 5300 & 5330A are often selected due to the high, 0.0001° resolution and unmatched accuracy of up to 2 arc-seconds which is maintained through built-in automatic calibration, thereby reducing the need for costly, periodic lab calibrations.