Yokogawa 255-350-BKBK A.C. Frequency Panel Meter 380-420Hz 120 Volts

Yokogawa 255-350-BKBK A.C. Frequency Panel Meter 380-420Hz, 120 Volts. New in original box with hardware. 3 7/8″ X 3 1/4″ 2 1/4″ min depth, template with box. Very good condition. purchaser responsible for any calibration, certification, proper installation and use. Good for a quick check of the line frequency output from unknown sources (aircraft inverters, generators or frequency changing power supplies) – which may be critical for some avionics.