New version of 521 mini tab!
Also driven by a single 18650 battery, Coil Master 521 mini V2 is a handy compact device for all vapers.
It is a multi-functional device that acts as an ohm meter, voltage drop checker, rebuilding station and firing test station.
The 521 mini V2 is able to measure the resistance down to 0.05 ohm, and dry fire their coils down to 0.1 ohm as well.
Reverse battery protection and short circuit protection are also built in for safty use.