Outdoor resistance thermometer
This version features a closed sensor tube and is intended for damp or humid rooms and outdoor applications. For application in hazardous areas, intrinsically safe versions are available.

Indoor resistance thermometer
This version is intended for dry rooms. The sensor tube around the sensor is perforated. As a result of this perforation, the sensor is in direct contact with the ambient air. This considerably improves the response time. The range of applications is enhanced by the addition of optional analogue or digital transmitters.