The GeekVape 521 Tab coil master is a fully digital ohm and volt meter. It also sports a firing button, much like its UD counterpart. The GeekVape 521 reads down of 0.01 ohms and all the way up to 9.9 ohms. In order to utilize the firing option, the lowest resistance allowed is 0.1 ohm.
The greatest part of the GeekVape 521 Tab coil master is its sleek, simplistic design. There are not so many features that the coil master is egregious to the user; it is simple to use, which is perfect for any vaper out there. The digital display is clear and precise as well.