Yes, there is a booklet in the kit. It's one page long and contains very basic troubleshooting instructions. I got it and after it worked properly it's amazing. I get what seems like a decent output. If you switch wires on the back, one of the temperatures, at least for me, just rises until you're scared enough to turn it off. It's not specified which is which, but just for troubleshooting I swapped the connections on the back and now it works great. I received it in one day, amazing.
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