Greisinger gth 200 air precision room thermometer greisinger gth 200 air p the greisinger gth 200 is a high precision indoor air thermometer that measures the temperature of ambient air the measurements uses a pt1000 precision sensor located in the probe tube and has to be protected from any dirt the open probe design and the precise sensor ensure fastest temperature measurements with the gth 200 a comfortable and practical one handed operation is possible p p ideal for calibration