A thermistor is "a thermally sensitive resistor" that is a semiconductor whose resistance varies significantly with temperature. In general, there are two types thermal senstive resistor. One is PTC ( Postive Temperature Coefficient); the resistance increases as temperature increases. The other is NTC (Negative Temperature Coefficient); the resistance decreases as temperature increases. The following description is applicable only to NTC thermistors.

NTC thermistor is an sensitive elements widely used in information system and control system, which is mainly used for temperature measurements, control, protection and heating. Thermistors are thermally sensitive elements of sintered fine ceramic semiconductor composed of several transition metal oxides, primarily Mn, Co and Ni. Their operating temperature range is from **0°C to ****0°C that covers the whole range necessary for ordinary temperature control. They are also small, stable and have great sensitivity. Thanks to these features, they are used in large quantities as temperature sensors and temperature compensation elements in consumer electronic appliances and industrial equipment.

Applications: 
Electric Aooliances: 
Cooker:  Electric stove, Toaster, Rice cooker, Induction cooker, heatig iron, Bread oven, Electric pan, Cofee maker, Gas stove. 
Heating &Cooling: Air-conditioning, Heaters, Warm bed, Electric carpets, Electric Blankets
Home Applianance: Water heaters, Boilers, Warm water bidet, Refrigerator, Washing machine, Room dryer, Bathtub, Washtand, Solar systems, Waste disposal machine, Solar heater.
Other Sets: Thermometers, Electric iron, Hair dryer, Hair coloring device, ironing board.
OA Set: Copier, Fax Machine, Inkjet printer, LCD printer, Laser printer, Matrix printer, Watches, Camera.
Automobile: Intake air temperature, Exhasust temperature, Cooling water temperature, Engine temperature, Transmission temperature, Auto air conditioning (interior / exterior / surrounding), Body (thin plate) temperature detection.
Agriculture: Greehouse cultivation, Germination machine, Tobacco dryer, baking utensils, Granary temperature regulation, Soil, fertilizer.
Industry: Industrial measuring instruments, Ice maker, developer thermostat, oil temperature, warmer, food processing machines, Oil bath.
Fishing: Temperature control, water temperature measurement, Sonar, seaweed farming.
Commercial: Refigerated display racks, vending machine, snow equipment, wine filling machine, ash recycling machine, cold car, battery charger, water purifier
Medical: Skin surface temperature measurements, rectal, Raynaud's disease diagnosis, incubators, infusion heater, dental amalgam insylation
Physical / Chemical Research: Temperature measuring, weather observation detectors, surface temperature measurement, reversing (guide) detection devices, satellites, geothermal temperature measurements, atmosphere observation etc.
Other temperature sensors