Pro Check Sensor for LPG with Grease & 3 SpacersThe PRO Sensor combines all the best technology of our ultrasonic sensing for the best sensor performance ever.LPG Tanks: All steel LPG tanks up to 1000 gallons, horizontal or vertical cylinders.Mounting: Mounts to the bottom by magnets.How to read level via Bluetooth: Free Mopeka Check APP on your smartphone or tablet, or Mopeka Check LED Display.Also compatible with Mopeka Wifi Bridge, allowing remote reading of sensor using APP.Power: CR2032 BatteryThis package includes 1 Pro sensor only.NOTE: This sensor is sold with tank spacers to be used on 20, 30 and 40 LB DOT Cylinders.