Product Description: Ultra low temperature senosr is designed to monitor temperatures in refrigerators or freezers. RTD sensor is made from high quality platinum resistance temperature detector connected to low temperature resistance cable and encapsulated into stainless steel tube. It features hexagonal crimping for better encapsulation.  The temperature range of -100C to +200C makes it perfect for ultralow temperautre freezers for vaccines, which require temperatures to be -80℃ and below.