Wow! MV improved their VV Box mod by adding a voltage indicator. How did they fit it in there? All the electronics run down the center of the unit and you need a screwdriver to adjust the voltage. You can also remove the back cover to do it by hand. Another awesome madvapes mod.
http://www.madvapes.com/Variable-Volt-Box-Mod-w-Voltage-Indicator_p_3462.html
http://www.madvapes.com/Variable-Volt-Box-Mod-w-Voltage-Indicator_p_3462.html