The 85094-19 is a DC hour meter from the Hobbs 85000 Quartz Plus series, designed to indicate operating time in hours and tenths. It operates on a voltage range of 10-80 VDC and maintains a quartz accuracy of ±0.02% across its full operating temperature range of -40°C to +85°C. Built with a custom CMOS integrated circuit, the meter features a relay-driven odometer housed in a totally-sealed, shockproof polyester case with a glass lens. With excellent resistance to vibration and shock, plus transient voltage protection, it is well-suited for monitoring usage on various types of vehicles and industrial equipment to schedule maintenance and track service life.