Never run out of LP fuel unexpectedly. Accurately measure how much fuel you have using the completely wireless Mopeka LP TankCheck Dual Sensor with Monitor Kit. The Mopkea TankCheck is an electronic device that very accurately measures the amount of LP Gas contained in most LP cylinders/bottles and wirelessly communicates that information to a remote monitor. Now you'll be aware of how much fuel is available at all times, simply by reading the remote monitor. Designed for RV use, the TankCheck LPG Sensor is specifically for use on steel cylinders with under 100-lb. capacity.• Monitor is capable of reading two sensors at the same time• Sensors and monitor operate on "watch type" batteries (included)• Includes feet pads to assist in mounting sensors• Kit comes with monitor, 2 sensors, 6 feet pads, and 2 screws Sensors communicate to monitor without wires via Bluetooth technology Installs in minutes, simply sync devices & mount For use on steel cylinders with under 100-lb. capacity. | AP Products Mopeka LP TankCheck Dual Bluetooth Sensor with Monitor Kit