Vizmo is a handy application that performs many kinds of calculations. It has many features that are essential for a day-to-day vaper. Full Ohm's Law calculator lets you calculate the voltage, current, or resistance. The battery drain gives you the detail of your battery with estimated run-time and amount of puffs. The coil helper gives you feedback on the calculations which will give you an estimate of the heat of the vape. The apps calculations are tested to be as precise as possible.