The 5D-9 with NTC Thermistors Through Hole RoHS manufactured by Hongzhi is a thermistor used to accurately measure temperature. It is typically mounted in a plastic mounting case (known as a through hole) and is compliant with the Restriction of Hazardous Substances (RoHS) directive. The thermistor is a negative temperature coefficient (NTC) device that produces a decrease in resistance with an increase in temperature. It is typically used in applications such as temperature sensing, temperature compensation, over-temperature protection, heat/cold controls, temperature instrumentation and temperature regulation.