Measure the temperature of a wall

[coen17st]

Hello,

I am looking for a thermostat that can measure the temperature of a surface, or in my case a wall. This is to measure when the humidity reaches the dew point. I would like to be able to see the measured value in domoticz. It can be Z-wave, WiFi or 433 MHz protocol

For clarity it should measure the surface not the room temperature.
Someone a product or idea to do?