1,Oven Sensor 2,Metal Shell NTC coating 3,High-reliability NTC thermistor ... SensorStainless steel 5x40mm or coustomer request.Metal Shell NTC Temperature Sensor, Ideal for Wide Temperature ControlWide operating temperature range: -30 to ... , air conditioner, unitary bathroom, medical apparatus, and instruments, floor heating thermostat, soil temperature, water temperature, and so on.