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 a ohm meterand voltage drop checker. Rebuilding test station and fire test station.It is able to test the resistance down to 0.5ohm. and dry fire their coils down to 0.1 ohms as well. Reverse battery protection short circuit protection are also built in for safety use.
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