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I know this doesn't help for sword making but I use a old toaster oven with pieces of hard fire brick laying between lower elements to help prevent temp swings. I then installed a PID controller complete with thermocouple and a small contactor to control just the original heating elements of the toaster oven. I removed and tossed all original temp controls of the toaster oven. According to the digital readout and multiple thermometers it keeps temps with a degree or two of set point.
I like using it rather than my HT oven for tempering.
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