Hour Meter, Display Type Electromechanical, Time Range 0 to 99999.9, Bezel Face Size 2.33 in dia, Bezel Face Shape Round, Bezel Face Type Flush Mount, Elapsed Time To 99,999.9, Operating Voltage 10 to 80V DC, Number of Digits 6, Display Units Hours/Tenths, Bezel To Back Length 1.5 in, Ambient Temp. Range -40 Degrees to 185 Degrees F, NEMA Rating 6, 6P, Material of Construction Lexan, Input Type Electrical, Reset Type No Reset, Temp. Range -40 Degrees to 185 Degrees F, Fits 2.0 in dia Opening