The Bernzomatic Digital Fuel Gauge indicates the amount of fuel remaining in portable propane tanks used with tabletop grills, portable heaters, lanterns, mosquito foggers and other propane-powered appliances. This pocket-sized device is easy to use whether you are out and about or in your garage. Designed with user-friendly functionality, the fuel gauge features an easy-to-read, digital LED display to indicate the amount of fuel remaining in your cylinder. It operates on two CR2032 batteries, included. This digital fuel gauge is compatible with any non-refillable fuel cylinder with CGA600 connection, including 14 oz Bernzomatic Propane fuel, 16 oz Bernzomatic Propane Camping Gas and 14 oz Bernzomatic MAP-Pro fuel.