Mechanical counter. It can work on most AC/DC 6-90V equipmentSystem timing, including: total accumulation hours tot, max hours: 99999.9h, resolution 0.1 hour.Unique design including: easy installation, snap-in installation, save time and effort, tool free6 digit display, easy to read 7mm digitsexternal of energy, long life of 10 years.Product DescriptionRL-HM009 Snap IN Mechanica Hour Meter for DC Equipment 8-80V powered such as forklifts, golf carts, floor care equipment and other battery powered equipment.Product function:System of Timing:Total Running Hours Accumulation TOTMax Hours: 99999.9H, Resolution 0.1 HourUnique Design:< p>Easy installation, long service life2-year warrantyProduct specifications:Display: 999999V with working indicator (Automatically recycle to zero)Digit Height: 7MMWorking voltage: 6-80V AC 50/60hz (This meter is DC 6-80V If you need AC 110-220V, please please kindly leave message to us &gt; Resolution: 0.1hoursStorage and operation: -40C to +85C temperatureHumidity: 95% RH + 32C for 2 hoursProtected From: Aiternator load dump, inductive SwitchingPolarity: Positive / Negative Case Style: Front Panel Mount, Other styles are available