A Capacitance probe is a Point Level Indicator commonly used for high or low level detection in a vessel. Capacitance Probes offer fail-safe operation, "quick-set" calibration, plus interference-free operation – working far below the RF level of 9-KHz at just 6-KHz – so they will not interfere with two-way radios or other equipment operating in the radio spectrum. Made for applications with excessive vibration, and available, with Certified for Hazardous Locations Rating for use in high-temperature environments.