- U.S. Sensor is a world class manufacturer of the highest quality thermistors as well as thermistor probes and assemblies . Our products are produced using proprietary state of the art processing techniques resulting in superior long term reliability. Our wide range of products include DO-35 Glass Encapsulated thermistors, highly accurate Precision Interchangeable thermistors, SMT thermistors, custom thermistor probes and assemblies and RTD’s and RTD assemblies designed to meet the most demanding applications.