Thermistor probe assemblies place thermistors and RTD's in a variety of custom housings to protect the thermistor from harsh environments and also to accommodate particular application requirements. Probe types are offered in a variety of types and housings. There are stainless steel, straight and cylindrical, flanged, over molded, ring lug, and threaded Hex style probes. There are probes with polyimide tube housings and TO-220 packages. Some probe housings are made of plastic or vinyl. Lead wires are offered in glass insulated, Teflon insulated, Kynar insulated, PVC insulated, Poly Nylon insulated, UL 1015 style and solderable versions.

Littelfuse acquired U.S. Sensor Corporation in 2017 and manufactures thermistor probe assemblies. Custom probe assemblies are available on request.