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

Quality seems to be good, and it's easy to configure. Wish it could switch to fahrenheit, but it's not a big deal because you set it and forget it. When you cut power to the controller it retains the settings. We're using it to control a small ventilation fan for the electrical compartment in our camper, and it's been working flawlessly! Small size, great value!

Solid unit. Good visual on the LCD screen. Programming good, instructions leave a bit to imagination. Not real clear how to set the hysteresis of the on/off cycle. Light, powers up and stores settings. Handy.

So far the only complaint I have about this this is the utter lack of any sort of documentation on how to use it. Other than that, it has worked great for the 45 minutes I spent playing with it.After a few minutes playing with it, however, I figured out how to use it. Here's the scoop, in case this helps anyone:1. Run 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 came connected so you may not have to do this.3. Connect the thing you want to control on the other two pins on the terminal block. It's just a relay aka switch, so it doesn't matter which lead you put where. That said, the unit DOES NOT SUPPLY POWER to the device you are controlling, so you have to treat this as a switch. That is, run one power lead (say, +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 lead of your device to the other power lead (GND, -V, or "neutral")4. Power up everything. The thermostat will need to be set before it does anything. This is really easy but undocumented.a. press SET until things start blinking.b. the bottom line will say C or H, followed by a temperature. C means "cool to stay under this temperature" and H means "heat to stay above this temperature". Press SET until the C/H indicator is blinking, then UP or DOWN to change between C and H.c. press SET again so the temperature to the right of C/H is blinking. Press UP or DOWN (you can hold these down to change values rapidly) until you get the temperature you want. If you selected C, this is the temperature where the relay will OPEN i.e. stop running your fan/cooler/whatever when the sensor cools down. If you selected H, this is where your heater/whatever will turn OFF.d. press SET again until the top temperature blinks. This is the "hysteresis" temperature. Basically, this thing controls where the relay will CLOSE i.e. turn on your fan/cooler/heater whatever. KEY THING TO UNDERSTAND: the hysteresis temperature is the difference between the "ON" point and the "OFF" point. Example: if you pick C20.0 on the bottom line and 5.0 on the top line, the thermostat will operate in Cooling (C) mode. It will turn on the cooler at 25*C (77*F) and it will turn off the cooler at 20*C (68*F). It will always try to keep the temperature between 20 and 25. Another example: if you pick H10.0 on the bottom and 10.0 on the top, it will be in heating mode and will turn on your heater at 0*C (32*F) and will turn it off at 20*C (68*F). If this doesn't make sense, just remember that in cooling mode it will keep the MAX temperature below the bottom PLUS the top value, and in heating mode it will keep the MIN temperature above the bottom value MINUS the top value. The larger the top value, the larger the allowable swing in temperatures, and the longer time your heater/cooler/whatever will be operating while it is doing its thing. That said, it will also run with fewer starts/stops, so that may be good for the lifetime of the heater/cooler/whatever.

Very easy to use. There are not a lot of programming steps, which makes it good for quick changes. I am using this to control a greenhouse heating mat. There is a mode (heat/cool) set point Temp, temp range, and alarm function. There is also a serial out for communication. I'm only using the temp on/off functions, so I don't know about the alarm and serial details. The only things, I would wish were different is the temp only reads in C, and the display's light is always on. Otherwise, its great for controlling 120V heater mats with minimum fuss.

Can't beat the price for the functionality of this controller but I'm stuck without a functioning system again after having just received my replacement order. I haven't even shipped the first controller that broke within two weeks back yet and the new one is already not working due to probe failure again. I'm just using the controller to turn some fans on and off over an aquarium. I'm coming to the conclusion that the probes do not appear to be waterproof. I've gone to great lengths to protect the controller which appears to work as advertised at least but the probes that came with this replacement and the original order both failed rapidly. The first died within two weeks and was reading 100+ Celsius higher than actual temp overnight. The replacement that arrived Friday was accurate on arrival but was reading 50+ Celsius higher than it should be within two days. The probe tips in both orders were protected and submerged, resting in the edge just under the surface of a saltwater aquarium. The probe just plugs into the board so it's replaceable at least but I don't see a way to order just the probe from the seller. Either way, they shouldn't fail within a couple of days or even weeks of use. If the probes are not really waterproof, please don't advertise them as such. I'll update this review if I get some help from the seller.

I used this for a power supply cooling fan controller in a 3D printer. Easy to program, and works great. I had to work some tweaks with the cover so that it could be mounted to it and still be programmed and read from outside the enclosure, but it worked out well enough as it's not something that needs to be changed much - if at all - once it's set. I would have preferred if the display and operator buttons were arranged so the card could be mounted directly to a panel face, but it is what it is.

Love it! Rewired a used hot tub and am using this controller to regulate the temperature. It is turning on/off a 12 volt DC relay that powers a 1 HP water pump. Easy to read and program. Works like a charm!

It is a cute PCB module. A simple menu is easy to set up. Recommended.