Device for determining a filling level of a liquid in a container

A device for determining a filling level of a liquid in a container, the device comprising a submersible unit communicatively connected to a float unit,

• the submersible unit having:
• a pressure sensor unit,
• a transmitter unit,
• the float unit having:
• a floating body,
• a further pressure sensor unit, and
• a further transmitter unit configured as a radio transmitter unit,
• wherein the further pressure sensor unit is arranged at or in the floating body in such a manner that, when the float unit is arranged in the liquid, the further pressure sensor unit is arranged below the surface of the liquid,
• wherein
• the transmitter unit of the submersible unit is configured as an ultrasonic transmitter unit and the float unit comprises a receiver unit configured as an ultrasonic receiver unit,
• or
• the transmitter unit of the submersible unit is configured as a light signal transmitter unit and the float unit comprises a receiver unit configured as a light signal receiver unit.