The PDIGR-TE200DR Series are rigid duct averaging temperature sensors. They are encapsulated in a 6.35 mm (0.25") OD, 304 stainless steel probe. All probes provide excellent heat transfer, fast response and resist moisture penetration. This temperature sensor is available with various probe lengths and various enclosures to fit any application. It can accommodate a wide variety of sensing elements such as NTC thermistors, RTD elements, Nickel RTD elements and IC sensors.