EH4B-RA - is used to monitor and control of your Electronic humidistat, EH4B-Remote Access device, allows reading of measurement data and control via Bluetooth (BLE).

In addition to displaying the current moisture content and temperature, the calculated dew point and absolute humidity are also displayed, as well as comprehensive operating statistics, instantaneously and historically.
All parameters that can be adjusted on the EH4B device can also be read and set in this app
So you can easy read and and set a parameter independently for any one of the three relays with adjustable hysteresis.