Device for humidity- and temperature-based fan control

Good morning,

I have fans installed in my house that turn on at a certain time using a timer to the socket.
I would like to replace this with a device that will detect the humidity in the house and the temperature. That is, when the humidity in a room reaches 70%, the fan switches on, or when the temperature reaches 25 degrees Celsius. Is there such a device or several that can be connected together and will switch on the fan?

That is, you need an electronic hygrometer thermometer with a potential-free output.

Clarify your requirements.
TH16 - mentioned above or TH10 has an attractive price, but also disadvantages: connection via WiFi and cloud by default - a problem with WiFi or internet can cause control problems. From the app you set the control either based on temperature or humidity - not both at the same time (you can give 2 connected in parallel - one based on temperature, the other on humidity).
On the plus side price, control and readings in the app, possibility to use with other sonoff devices within the app.
A more expensive solution from the cheap category are Zigbee devices - e.g. Tuya - minus you need a Zigbee gateway (this one is not expensive as for a gateway), but the stability is much better, it does not affect the WiFi network (but still works in the cloud), you can select devices and do more automation within the application - a set can consist of e.g. a humidity and temperature sensor (one based on temperature and one based on humidity). with a humidity and temperature sensor (e.g. ZigBee T1 Tuya or with a display - type "ZigBee TUYA LCD humidity temperature sensor" into google) + an actuator - e.g. a box switch.
These are just examples, there are many possible solutions....

Everything, of course, has to be selected according to the power of the fans (or use a contactor), the required degree of protection, etc.