An NTC thermistor is packaged in the form of a Bulk. Bead, Glass includes it as a convenience. To ensure that the NTC thermistors function properly, the resistance tolerance must be ±20%. A temperature setting of -60°C~300°C is required to ensure reliable performance of NTC thermistors. NTC thermistors are reliable when operating at 300°C. NTC thermistors can operate at -60°C for relability.