Digital Panel Meter Frequency Input Range 20 to 199.9Hz Accuracy +/-0.2 Percent of I/P +/-0.2Hz Display Span 20 to 199.9 Display Digits 3-1/2 in Gray LCD Display No Excitation Fits Standard 3/648 DIN Cutout Connector Type Screw Terminal Process Connection No Power Required 85-250V AC Style 24x72 Includes Instructions Manufacturers Warranty Length 1 yr