Level sensors and transmitters measure, monitor, and display liquid levels in a tank, drum, or container. They're used in the pharmaceutical industry and food and beverage manufacturing. Contact liquid level sensors and transmitters immerse in liquids to measure and monitor levels. Non-contact liquid level sensors and transmitters mount outside or onto the bung port of a container or tank, using radio or ultrasonic technology to measure levels. They do not immerse in liquids and are suited for corrosive liquids, wastewater, and bulk storage containers. Liquid level transmitter displays show measurements gathered by contact and non-contact liquid-level sensors.