E-outstanding Temperature Controller DC 12V Digital Cooling/Heating Temp Thermostat -50-100 Degree Controlled Switch Module W1209 + Acrylic Box

I bought this to control the fans for the lights on my aquarium and it’s working perfectly. I have a heavily planted tank and the lights can raise the tank temperature sometimes but this little thermostat kicks on and cools them down then cuts the fans off when they’re cool. It does use Celsius and it doesn’t come with instructions but it’s not that hard to figure out.

This thing just works. It's that simple. Connect the appropriate relay for the load you will be pulling, mount the sensor in the correct spot and set it up. That is the last I had to think about mine.

Exactly what I needed. I live in Texas where it gets so hot the roads get soft in the summer. In my truck I installed a fan to keep my sub amp cool during those hot days. I was controlling it with the ignition switch. My kids mentioned it’s really noisy in the back seat. I have a 2007 Tacoma crew cab. So this little controller is what I needed. First I got a led light and a 12vdc power supply and bench tested and verified the temp read out. It worked perfectly. So I set it up to 40c (104f) and installed it in my truck. I installed the temp probe on the cooling fins. After playing some DJ Magic Mike the temp only rose up to 37.5c. So I’m still waiting for a hot enough day to truly test it. The bench test passed with flying colors. I will check back in a couple of months from now with an update.

This product came unassembled and did not include instructions for assembly and programming.

PRO:Accurate temp readings from thermistor.Cute acrylic case...but you need to trim down the soldered leads on the PCB to fit into the case See pic).It is just a circuit open/close switch actuated on rising or falling temperature.Solid little item.Con:Not waterproof at all...but wasn't expected to be, so not a con really.

Failed the relay contacts after a few hours running at 75% capacity, even with a heat sink attached to the relay. Not unexpected, but, I wanted to give it a try. It's a shame the massive capacity claim, however, the attractively built unit does a decent job tracking the temp. Even after the relay contact failure, the unit continued to run, so I listened for the click and controlled my heater manually until I cold get a replacement controller. The box was reasonable to assemble using my third arm and hand, fitting those tiny bits, pieces, nuts, and bolts.Didn't bother with a return, although, I should have.

I love this product! I have built several of these into my projects for amateur radio. The controller closes the N.O. contacts (K0 to K1) depending on where you set the temperature on the led readout. It does not provide any voltage to the contacts, however you can just jumper 12v to one side of the relay (K0) and when the relay closes, it will provide 12v to your device on K1. Easy-Peasy. My only gripe is there is NO MANUAL included, so after a bunch of button pushing, you will figure it out. (Three buttons = SET, +, -) I did play around with it and if you HOLD a button, you enter different mode(s) to maybe set C or F but I have never gotten it to stay in Fahrenheit mode. I just google C to F and set it to the desired temp. One last gripe is the sensor cable is not very long (12"). I wish it was longer.

I would recommend using a relay to power anything and use this as the trigger for the relay. Ordered one and it couldn't handle 6.3 amp, burned up the relay built in. Refund was issued fast, ordered two more from another company for $1 cheaper than this company.