Precise measurement results - Truma LevelControl uses ultrasound to precisely measure the fill level of the gas cylinder in per cent and the amount of gas in kilograms. Measurement results sent directly to your smartphone via app. Easy to use - Simply attach the Truma LevelControl gas meter under the cylinder using the integrated magnet and remove it when changing the cylinder. No installation, no cables. Start the app - done. LevelControl app - Attach the LevelControl under the cylinder, start the app, check the gas level - it couldn't be easier. Universal - Suitable for all standard European steel gas cylinders with a diameter of 200-350 mm and also fits aluminium cylinders thanks to the separately available clamping plate. The LevelControl is not suitable for plastic gas cylinders, fillable tank gas cylinders, gas tanks or butane gas cylinders. Truma promise - Truma has been known for decades for its quality, service and innovative spirit. The products are the result of years of experience, know-how and passion. Quality that pays off.