text: The Coil Master 521 Plus Tab is a totally redesigned and multi-functional device continuing
  the heritage of former versions of the world famous tab line, in order to dry burn your coil,
  test the battery output and voltage, as well as checking each coils resistance value.
  Driven by a single 18650 battery, Coil Master 521 mini Tab is a handy compact device for vapers.
  It allows users to use it as a build deck and is able to 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.