Product review (4 stars): Worth the purchase for fermentation temp controller
I can not compare this to the common products used for fermentation temperature control (Johnson and Ranco), though I can say I have been very happy with the performance of this device. The device caused me to realize how important and useful temperature control is. I just purchased my second one. It appears (and acts) to be just as sensitive as both competitors are specified to be, with the benefit of the adjustable short cycle delay. The temperature probe cable is short, but is easily extended, though the short length has worked fine for me. I put together the wiring with some clearance power cords from Target for a few bucks. It was a bit frustrating to wire with the clearance extension cords I purchased, but the cost was minimal, and the result is fully functional. It was completely worth the effort once it worked. I wired my second device differently.

After talking to an electrical engineer colleague, the wiring diagram on the control products website seems to be correct.