The LC Level Controller is an electronic instrument for displaying tank contents in volume percentage and liters. It supports all common tank shapes (cubic, cylindrical lying or standing). Multiple measurements for the highest reliability are performed contact-free using ultrasonic pulses. The tank content is determined from the tank parameters and the measured distance within the tank. Simple and maintenance-free installation on the top of the tank is achieved through two integrated thread sizes on the sensor. Highly reliable, it serves as a replacement for mechanical tank gauges in heating oil, water, rainwater, and waste oil tanks, as well as many other applications. It displays: tank content in liters and percentage, tank free space in liters, distance measurement in cm, daily consumption, and range of the tank contents.