The TR Series glass encapsulated thermistors are a special breed of NTC thermistors. These small thermistors are hermetically sealed to eliminate erroneous resistance readings due to moisture penetration, and they function effectively in extreme temperatures and harsh environmental conditions. These thermistors are not limited by soldering temperature and offer the user a wide operating temperature range of "-55°C to +200°C". With a diameter of only 1.5 mm, the devices are small enough to be packaged in a variety of housings such as ring lug and hexagonal nut.