Thomas Products Ltd. manufactures level switches including custom, bottle, side-mounted, single-level, pancake, and liquid level indicators. The company's liquid level indicators are for use in hazardous locations and feature 3/4" NPT mounting sizes, operating temperatures of -40 to 225F, and operating pressures of up to 400 psi.

Advanced Control Technology Inc. manufactures liquid level float switches including horizontally-mounted and vertically-mounted configurations. The horizontal liquid level switches include tank exterior removable, universal mountings, and miniature side entry, while the vertical switch types include continuous output, micro miniature, miniature, universal, and high buoyancy.

FPI Sensors Inc. manufactures liquid level switch types including single and multi-level float sensors, side mount, leak detection, continuous measurement, temperature, optical, capacitance, 90-degree side mount and customized. The various switches are used to regulate single and multiple levels, and provide low level sensing, high level alarm, leak detection, overfill shut off, and level and temperature control.

Omega Engineering manufactures two-wire liquid level float switches for use in chemicals with a specific gravity of 0.75 or higher. The switches feature stainless steel construction, a NEMA-4X or NEMA-7 rating, and can continuously monitor liquid levels with proportional 4-20mA output.

Whitman Controls manufactures side-mounted level switches and vertical-mounted level switches with 1/2" NPT, 1/8" NPT, or 1/4" NPT fitting types. The switches are used in liquid process systems including drinking water systems, and within the oil and gas industries.