The Shimpo DT-3015N Portable Xenon Stroboscope with Rechargeable Battery is a rugged, battery-powered xenon stroboscope designed for non-contact RPM measurement, inspection, and observation of moving parts by "freezing" or "slowing down" the motion. The Shimpo DT-3015N Portable Xenon Stroboscope with Rechargeable Battery provides power flexibility as in addition to its internal rechargeable battery it can operate from AC power.