With the Truma LevelControl, the filling level of gas cylinders can be precisely determined and retrieved via an app. The well-thought-out design of the sturdy housing and the rubberised surface transitions enable universal use. Thanks to integrated high-performance magnets on the contact ring and an ergonomically designed grip area, it can be easily attached to the bottom of steel cylinders. A battery-operated ultrasonic sensor identifies the gas level by measuring the transit time and, using the Bluetooth Low Energy protocol, transmits it to a smartphone or tablet.