ITC-608T Hum sensor

Does anyone know if the ITC 608 has a calibration setting for the humidity sensor it has been working great but here lately it is reading 10% less humidity than where it is actually at it is about a month old? It’s really humid inside of my greenhouse and the sensor is not reading properly to bring on my fan for some ventilation

ITC-608T can be calibrated by CA settings.
If the humidity probe reading is 10% lower than the actual value, please set CA=10