This temperature and RH probe was replaced by the CS215 or HMP50. The XN217 contained a Fenwal Electronics UUT51J1 thermistor and a Hygrometrix cellulose crystallite RH sensor. The rel 0 to 100% RH. It required two single-ended analog input channels for measurement. Yearly calibration of sensor with salt solutions was recommended. For compatible radiation shields and mounts see the Tripods, Towers, and Mounts section.