Not bad (so far) but this device could definitely be improved. 1.: The length of the temperature sensor is too short. The box should be very close to the area you are adjusting. If the probe wire was at least 1 foot longer, if not more, this device would be a great device. 2nd: instructions suck. With guidance you get what you need. I feel like it got lost in translation or there just wasn't enough information for this device to work properly. In any case, it is still unclear how it will perform in the long term, but it seems to be doing what it promises in this short time. Time.
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