🌡️ Weewooday 6-Piece W1209 Micro Digital Thermostat Temperature Controller Board with Case, 12V DC -50-110°C Electronic Temp Control Module Switch with Waterproof NTC Probe Review

Previous models were slightly larger, I like the space saving, outdoor testing waterproof and more. Easy to assemble. Looks nice. The light blue LED lights up. Easily customizable and adjusted as needed.

I use one of these as a backup for an Alexa controlled hot water circulation system. Alexa actually sets the pump on time, and it's a backup that shuts off power to the pump in case Alexa goes nuts. They're so cheap I couldn't even buy a relay for that price. And they are already assembled! Why do I need 6? I do not know yet.

This little device is easy to connect and works well. It comes with a clear plastic box, you can put it in or not, it's up to you. It's accurate and can be set when you want it on and off. I use it to turn a 12v greenhouse solar exhaust fan on and off depending on the temperature. The only downside for some is that it needs to be set in Celsius.

Luckily the very first unit I assembled burned out straight away! What I've learned is that the turn-off circuitry depends on the LED to power the logic input of any gate, which actually turns the relay off. So when your LED goes off, make sure your hardware keeps running even if you want it to shut down. . OTHERWISE, DO NOT USE this product for things that could be harmful if left unchecked! Now that I've saved you from incalculable expenses, let me tell you what a fun, awesome, easy, and…

[Updated 2021-02-28] Uses it for heating in greenhouses (see photo) including inserting the probe into the ground. Excellent. [Original from 09/29/2020] I was looking for something inexpensive for a potential winter protection plant. These 6 packs are more than I need, but it's nice to have backups. Assembling the case took about 10 minutes between removing the covers and fumbling with the tiny screws. Enough to keep my coffee cold. But it's a one-time thing, and the case is actually pretty…

They work very well in our prototype hot water control system. We have replaced the electric heater and old convection gas stove with a water heater that provides both hot water and space heating (using the old stove's water heat exchanger and air diffuser). The project isn't quite complete yet so there are cables scattered everywhere and we still have a few leaks, but we know the temperature at all the important connections so we can set up the system to work as we expect. We've replaced the…