Great scale looking and functional must have! - do a Final check just before takeoff!!
The Prolux Voltspy is a very accurate on board voltage indicator for 4.8 or 6.0v receiver nicad or Nimh packs or 2s - 3s lipo packs 7.5 - 12v It can prevent unnecessary and unexpected crashes due to flat nicads/Nimhs or charging problems. It can also identify problem nicad/Nimh/ li-po packs. In operation, the Voltspy is capable of monitoring minute changes in the nicad/Nimh voltage.
A compact and lightweight on-board battery voltage monitor. 4.8 - 12.6v selectable, with 7 highly visable LEDs. Features a universal plug compatible with most brands of radio control equipment. A must-have item for any model aircraft.