Hobbs hourmeters provide high standard of quality, with in process parts inspection 100% function, burn-in, and timing accuracy. Hourmeter indicates operating time in hours and tenths, plus has a running indicator. Totally sealed has standard terminals – 1/4″ male blade. Quartz accuracy ±200 ppm, ±0.02%. Operating voltage range: 10-80 VDC. 2 styles available: Rectangular two-screw mount, has panel cutout 1.45 x 0.95 rectangular opening with two .150 holes spaced 1.750. Round three screw mount, has panel cutout of 2″ diameter opening, Three 1.50 holes equally spaced on 2.53 bolt circle diameter.