Abstract: A system, measuring device and related methods for measuring a fill level in a container or tank are disclosed. The measuring device utilizes high-frequency signals for sensing a fill level in a tank filled with a liquid such as, for example, liquefied petroleum gas, in particular propane and butane, oxygen, nitrous oxide and anesthesia, CO2, nitrogen, gas air, helium, generally liquefied gases, but also water, oils, or any other liquid either pressurized or not pressurized. The measuring device being capable of communicating wirelessly and remotely with other devices in the system to calculate and communicate the fill level in the container.