Simple digital temperature (-30°C to +80°C) and humidity sensor for indoor use, communicating over RJ11 (1-Wire bus). The sensor is designed for connecting to Poseidon, Ares, STE2 units.
The information about time related sensors precision and the need for calibration can be found in this application note https://hw-group.us/support/sensor-accuracy-over-time.
You can also get a sensor with a calibration protocol.