Digital Panel Meter, Frequency, Input Range 20 to 199.9 Hz, Accuracy +/-.2 Percent of input +/-0.2 Hz, Display Span 20 to 199.9, Display Digits 3-1/2, Red LED Display, - Relays, True RMS -, No Excitation, Use With -, Fits Standard 1/8 DIN Cutout, Connector Type Screw Terminal, Process Connection -, Power Required 120V AC, - Interface, Output -, - NEMA Rating, Depth 2.94 in, Mounting Clip, Style Falcon, Includes Instructions