PHOTOGATE TIMER: Photogate pair

Comprises a very versatile digital photogate timer, accurate to 0.0005 seconds, size 150 x 150 60 mm with 9V battery included. Two photogates with thumb screw clamps for easy positioning and connecting leads. Photogate opening size: 650 mm. Instructions supplied. Has five timing modes: mode 1 - Interval mode which measures beam interruption. mode 2 - Frequency mode which measures frequency of regular interruptions. mode 3 - Period mode which measures the time of the first and third interruption. mode 4 - Count mode which keeps track of the number of times the photogate is interrupted (for pendulum oscillations). mode 5 - The timer can also be used as a stopwatch.