I'm just starting to coil build & coil master appears to be pretty well regarded. It's reading my coil resistance the same as my mods do👍
I got a bad batch of ec coils (NOT purchased on eBay 👎) & the tester saved me a LOT of time, effort, & mess - I'm very happy with it.
My coil master don't function correctly will not fire up. Oils very unhappy with it.I would be happier with the fullside or the one you can use as a vaporizer temporary.