I ordered 2 pcs WiFi Temp controllers. It not work reliable, tested both devices unreliability is same type. Temperature on display jumping to 12C; 120C, 82C after some seconds back again to normal ambient temp. Relays clicking between heat and cool mode. In any case very unreliable for any serious applicable. Seller suggested me to make unplug/plug sensor connector, but it not help.
the measurement is not stable and is jumping from a normal read out to a completely different one and send a stop message to a pump.....