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I just built a second PID for my bullet coating oven yesterday. I used the MYPIN T Series pid for my pot and oven for the past couple of years with no issues. I don't know if it would be worth changing out to a different brand to solve your issue?
Nice project you got here, I will say a bigger box made it easier for me to get all the connections made yesterday.
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You are probably right with the different brand. Seems like there are a bunch of these Chinese made controllers. I might try to find a slightly larger box for the next one. I, for some reason, really want a usb and 110 outlet on it as well. I ended up just writing a few C to F temp conversions on the lid for quick reference.