Overall seems to work well, lots of options to set up but for basic operation it works right out of the box. I am using this for a 200w heating system and the PID parameters seem to be holding the set point excellently. There is actually a schematic/pin numbers on the side of the controller, and the thermocouple, relay, and heatsink all seem to be doing their job. Due to the low power of my system I don't actually use a heatsink with a relay, I use it for something else. The manual mentions that you have to hold down the "<" key for more than 2 seconds to enter autotune mode, but I can't do that. I was a little concerned but it looks like it either has great initial values or some sort of adaptive setting as it works very well within +/- 0.1C. Better quality than I expected for the price and a PDF manual is available on the Inkbird website. I will buy it again if I need something similar in the future.
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