Hour Meter, Display Type Electromechanical, Time Range 0 to 99999.9, Bezel Face Size 2.75 in dia, Bezel Face Shape Round, Bezel Face Type Flange 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 -22 Degrees to 149 Degrees F, Material of Construction ABS, Input Type Electrical, Reset Type No Reset, Temp. Range -22 Degrees to 149 Degrees F, Fits 2.0 in dia Opening