In summary, a thermistor is a temperature sensing element made of sintered metal oxide that displays large changes in resistance in proportion to small changes in temperature. Resistance decreases as temperature increases for NTC Thermistors. Important considerations when selecting a thermistor include temperature range, accuracy, stability, packaging, and noise immunity. Configurations include Disc and Chip, Epoxy, Glass-Encapsulated, Probe Assemblies, and Surface Mount. More factors to consider when selecting NTC Thermistors include the specific electrical properties (current-time characteristic, voltage-current characteristic, and resistance-temperature characteristic), type and size of the product, resistance-temperature curves, nominal resistance value, resistance tolerance, and beta tolerance.