The Shimpo DT-311J Splash-Proof Stroboscope is designed for use in the harshest manufacturing environments and meet the specifications of protection code IP65. They are designed for observing fast repeated motions and for determining RPM or inspection and observation of moving parts by "freezing" or "slowing down" the movement. The instrument can be triggered by means of an external sensor (power supply for the sensor is provided by the stroboscope). The flashes can be delayed either in time or in rotation angle.