The Bernzomatic Digital Fuel Gauge is a convenient accessory designed specifically for use with propane gas and MAP-Pro gas cylinders. Made of durable plastic, this fuel gauge features a digital screen for read outs The BZOFG model by BernzOmatic allows users to easily monitor the fuel levels of their propane tanks, ensuring a constant source of propane for cookouts , grills, and know if you have enough for welding and soldering projects.