Downloadable computer software for receiving and displaying information from electronic transmitters; downloadable computer software in the nature of a mobile application for receiving and displaying information from electronic transmitters; transmitters of electronic signals; electronic transmitters and receivers for transmitting information from dials, gauges and sensors; liquid level measuring devices in the nature of gauges and sensors; sensors for use in measuring liquid level, liquid petroleum gas, anhydrous ammonia levels, and industrial calibration sensors; sensors for measuring liquids and liquefied compressed gasses; vehicle, watercraft, aircraft, storage vessel and industrial liquid level measuring devices, namely, sensors for measuring liquids and liquefied compressed gasses; sensors, namely, float-operated, liquid-level indicating sensors, bulk cargo tank sensors for measuring liquid level, and float-operated, variable resistance sensors for use in measuring liquid level, pressure and position; sensor for sending fuel level information in fuel tank sending units to an instrument or control panel; capacitance, guided wave radar and spiral gauge liquid level sensors; electric liquid level switches; leak detection sensors; temperature sensors; flow direction indicators; dials for displaying detected values; transmitters of electronic signals and sensors for liquid level indicating in liquid petroleum gas tanks, vehicle fuel tanks, liquefied gas storage tanks, and water tanks.