Review on 🌡️ High Accuracy Electronic Thermostat Controller - DROK DC 6-30V 24V Digital Temperature Control Board: -50 to +110 Degree Celsius, LCD Digital Micro Temp Control Switch Module with Waterproof Sensor Probe by Shahed Cleveland

The only complaint I have about it so far is the complete lack of any documentation on how to use it. Plus, it worked great for the 45 minutes I spent with it. However, after playing with it for a few minutes, I figured out how to use it. Here's the scoop if it helps anyone: 1. Apply power to the +V/-V pins on the terminal block. I used a 12v power supply and everything worked.2. Connect the thermocouple sensor. Mine has hooked up so you may not have to.3. Connect the object you want to control to the other two pins of the terminal block. It's just a relay, aka a switch, so it doesn't matter which wire you put where. However, the device does NOT provide POWER to the device you control, so you must treat this as a switch. That is, connect a power wire (e.g. +V or "hot") to one of the switch pins on the thermostat, connect one end of your device to the other pin, and connect the other wire of your device to a different power source. Output (GND, -V or "neutral")4. Turn everything on. The thermostat must be set beforehand. It's very basic, but undocumented. a. Press SET until everything flashes. b. The bottom line says C or H followed by the temperature. C means "keep cold at this temperature" and H means "heat to stay above this temperature". Press SET until the C/H indicator flashes, then press UP or DOWN to toggle between C and H. c. Press SET again so the temperature to the right of C/H flashes. Press UP or DOWN (you can hold them to change values quickly) until you reach the desired temperature. If you chose C, that's the temperature at which the relay opens, i.e. stops your fan/radiator/whatever when the sensor cools down. If you choose H, your heating/something turns off here. e. Press SET again until the upper temperature flashes. This is the "hysteresis" temperature. Basically this thing controls where the relay will CLOSE, i.e. turn on your fan/radiator/heater, whatever. IMPORTANT: The hysteresis temperature is the difference between the "ON" point and the "OFF" point. Example: If you select C20.0 in the lower row and 5.0 in the upper row, the thermostat will work in cooling (C) mode. The cooler turns on at 25°C (77°F) and turns off at 20°C (68°F). It will always try to keep the temperature between 20 and 25. Another example, if you select H10.0 below and 10.0 above, it will be in heating mode and turn on the heating at 0*C (32*). . F) and turn it off at 20*C (68*F). If it doesn't make sense, remember that in cooling mode the MAX temperature is kept below the lower PLUS upper value and in heating mode the MIN temperature is kept above the lower value MINUS the upper value. The higher the upper value, the greater the allowable temperature swing and the longer your heating/cooling/whatever will run to do its job. However, it also runs with fewer starts/stops, so this can be good for the life of the heater/cooler/whatever.