LIGHT GATE ASSEMBLY UNILAB
For timing experiments. Consists of photo-transistor and light source combined into one easy-to-use unit. Free standing, with rod for clamping to retort stand, sockets for lamp and photo-transistor. Includes full protection against wrong connections, and a red LED that indicates when the unit is obstructed. For use with digital stopclock and timer, QED timer, Fast timer, Scaler timer.