🌡️ RioRand 12V DC Digital Cooling/Heating Thermostat Temp Control -50-110 °c Temperature Controller 10A Relay with Waterproof Sensor Probe: Efficient Climate Control Solution Review

This is a fantastic little circuit board. I've been using it for about 18 months now with no problems. My app is for controlling the AC compressor in my 1990 Honda Civic as the thermostat switch is no longer available from Honda nor is it made by an aftermarket manufacturer (that I could find). Regardless, the price is right and once programmed (which is easy!) it works like an OEM part.

Works well for a compact and inexpensive device. I use it to keep my 3D printer hot bed warm. I bought a 12v power supply to power it and placed the temperature sensor in the base of the hot aluminum bed. I had to adjust the delta and settings to make it support the ABS printing temperature range, but other than that it just worked right out of the box. I've been using it for a little over a month, no problems at all.

Wow, that thing is freaking cool. It's a good price and it even outlived me. I connected it to a remote controlled RF switch which turns it on. When it exceeds the temperature I set, it turns on my battery-powered O2 Cool fan. Every time I turn off and then boot up, it still remembers the last set temperature. I thought it was cool. I love how accurate the LCD is to the decimal point and it seems to be quite accurate and detect temperature changes as I would expect. When the relay switches, it…

I've built a lot, wired a lot, understand how things work, computer scientist by trade. This little device has the WORST instructions I have ever seen on how to set it up. Even YouTube videos and tutorial PDFs are not clear. So here's what I learned so you don't have to make the same mistakes. 12 V is required to power the circuit board - the two right terminals + and - ground. That's easy. Then someone said you can put jumper + on K0, the leftmost terminal, but if you do that the relay switch…