Abstract: A liquid level and temperature sensing device for monitoring and measuring the level of liquid stored within a tank or reservoir comprising control circuitry to generate and transmit digital level interrogation pulses and a transducer to receive sonic level return signals corresponding to the digital level interrogation pulses and generate corresponding digital level signals and logic circuitry to measure the time lapse between corresponding digital level interrogation pulses and the corresponding digital level signals and a lower sensing probe including an inner conductor coupled to the control circuity to receive the digital level interrogation pulses and a float to float on the liquid within the tank or reservoir including a magnet movable tube to interact with the electromagnetic field generated in the inner conductor by the digital level interrogation pulses to generate the corresponding sonic level return pulses transmitted to the transducer to generate the corresponding digital level signal whereby the