I figured out it is possible to get voltages from 0-20 if I set the fine adjust low enough (even though the manual says not to do this), but you can only get these low numbers as you turn it down, and as you turn it up it just waits and jumps up to 20. I don't know if low voltages like those are useful anyways.
Check this out this kit: https://www.amazon.com/Tekchic-Burning-Pyrography-Adjustable-Temperature/dp/B071J8G51H
Some other options in the same price range:
https://woodburning.com/collections/standard-kits/products/cub-standard-kit-w-fixed-tips
or:
https://store.razertip.com/mm5/merchant.mvc?Screen=PROD&Product_Code=SK-1HD
Do your own research though.
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