TRM Sensors develops proprietary leak detection sensors for crude oil, diesel, jet fuel, gasoline, natural gas condensates, and oil field brine. Their sensors can be used indoors and outdoors in wet or dry environments. They have different sensor probes like the TRM-CC series that detects hydrocarbons and ignores vapors and water, the TRM-CB series that detects crude oil and brine, and the wireless DFS-2 and wired DFS-3 sensors that detect diesel fuel leaks indoors. Their sensors use resistive changes to detect leaks and have no internal circuitry beyond wiring connections.