Abstract: It is desirable to be able to indicate the quantity of liquid left in the fuel tank of a vehicle. This is conventionally achieved with the aid of a float movable along a resistance wire. The invention offers an improved design of a liquid gauge consisting of two parallel rods (16 and 17),having resistance wires (18,19 respectively) wound around them and being surrounded by a float (6,7,15) with a contact (1-5) connecting the two resistance wires (18 and 19) to each other and arranged between the two wires (18 and 19).