Product review (5 stars): Awesome!
I bought this to control my fermentor fridge and it works like a champ. There are cheaper controls but I really like the features of this one and cheaper is not always better. I already had a Johnson A19 controller and it works great but it's single stage and not super accurate. The TC-9102 gives me total control over my fermenting temperature within 1 degree. With this controller you will have wire it yourself and buy a few more materials but if your DIY savvy it's no big task. For under $100 you will have the best temp control setup out there. I used a 75w black light bulb (about $4 with socket) for the heater but there are several options you can go with. Overall it's a great product at a great price! I would not hesitate to recommend the TC-9102 to anyone that needs to preciously control temperatures.

  As stated in other reviews get the wiring diagram from Control Products website. I switched from common leads to the hot leads to the relay for safety sake. I also installed a switch to cut power to the whole unit for convenience. You may also want to get the users manual from the site also as the one that comes with it is micro printed.

P.S. To make the temperature reading more accurate for liquid temperature I wrapped the probe in plastic wrap and placed it in a jug of sanitizer. The fridge cycles a lot less than when reading ambient temperature. Fairly low tech solution but it seems to work.