Propane Tank Gas Level Indicator; Mopeka Products; Use To Indicate Level Of Propane; For Horizontal Or Vertical Steel Tanks Up To 1000 Gallons; Uses Ultrasound To Determine Level; Magnetic Type; Gray; With LED Check Display Or Bluetooth For Mopeka Check App; Compatible With Mopeka Wifi Bridge; With CR2032 Battery; Without Tank SpacersThe Mopeka Tank Check is a magnetic sensor that mounts to the bottom of the LP tank to indicate the level of propane left in the tank. The sensor works via Bluetooth to send readings to the monitor or Tank Check app on your smartphone or device. The app can support multiple tank monitors at once. The level is updated every 5 Seconds when your device is within 150 Feet of the sensor. Smart Technology Compatible: Bluetooth Used To: Indicate Level Of Propane Functions: Ultrasound To Determine Level Type: Magnetic