Feature●DUAL WIRELESS TANK MONITOR - Bundle of 2 items includes 1 Mopeka Pro Check Universal Sensor and 1 Mopeka Tank Halo - Monitor the level of all BBQ, RV, food truck, patio heater, and industrial LPG tanks wirelessly from your phone with Mopekas patented Pro Check Universal sensor.●EASY INSTALL - Mounts to bottom by magnets and locks to tank level in seconds with improved ultrasonic performance. Strong magnets will not fall off your RV propane tanks, even on bumpy roads. Great accessory for all standard and custom LPG tank sizes up to 250 gallons.●IMPROVED BATTERY - 63% increase in battery life of the sensor over the original Pro Check. Now with 3 to 5 years battery life●LATEST MODEL - The Pro Check Universal is Mopekas latest patented ultrasonic sensor with improved reading quality and accuracy. Includes integrated temperature sensor, tank "bubble level", configurable sample timing, firmware updates, alarms/alerts, and more. Supports vertical and horizontal cylinders.●FREE APP - Free Mopeka "Tank Check" app from the Apple or Google Play stores. Unlimited tanks and sensors allowed with programmable alarms. Read from the app while away from home using the Mopeka Wifi Bridge or monitor without a phone using the Mopeka Monitor (sold separately)Description Mopeka Pro Check Sensor (1x) and Tank Halo (1x)