For LINEAR AIR TRACKS,  this mains operated Dual Timer can connect to 2 separate Photo Gates and can measure and store the 2 times separately for later recall.   

When not using an Air Track with PhotoGates,  the timer can be used as a general Lab Timer.  

This Timer is a variation to out famous LB4064-101 high speed timer which can time to 0.1 milliseconds.    Large LED display for easy reading in the classroom.

This timer can control also the dropping of a ball on an IEC Free Fall Apparatus and accurately measure the time for the fall.     Socket for this application is on the rear face of the instrument.