Timer & Photogates
A very versatile Photogate timer battery operated. There are five timing modes, including:
Interval mode which measures the time of interruption. Frequency mode which measures frequency of regular interruption. Period mode which measures the time between the first and third interruption. Count mode which keep track of the number of times the photogate beam is interrupted. It also works as a normal stopwatch. Includes a pair of photogates, 9V battery and instructions.
Size: 15 x 15 x 6cm.