Solid state hour meter helps keep track of machine, transport vehicle, or equipment hours for scheduled maintenance, warranty or other applications. Large six digit LCD display. Exceptional reliability due to nonvolatile (EEPROM) memory which can retain data for 25+ years. Two wire hook up. Operates on a large voltage range of 12-48V DC or 100-230V AC. Mounts into 2-1/16" round hole. U-clamp and thumb nuts included for panels from .03" to .25" thick. Operating temperature -40°C to +85°C. Meter case is made of black lexan with black anodized aluminum bezel. Lens is glass.