521 TAB Mini Coil Master Burning Measure Building Platform V3

This device is a gem, accurate, precise, and most of all SAFE. I've been building my own coils for a few months now, and this little device has been a godsend. you can turn it off to prevent shorts, use it in meter mode for testing resistances, and with the flip of a switch and press of a button you can dry fire your coils for fine tuning. Hell you could even use the thing as a simple mod all on its own if you were so inclined. I've never used the battery charging feature, but it's there if you need one.

It gives error codes, most all Tabs dont. Uses 18650 battery. USB power as well. Its had more thought put into it than ones I've owned. The tiny toggle switch is annoying.

Fired it once and saw smoke come out of the wrong spot.

cheap construction...

one battery and gives me a dozens burns before I need to replace the battery

Ok