Our premier photogate timing system combines state-of-the-art electronics with the durability you require in the lab. The two large (10cm-wide) gates are equipped with a universal clamp, allowing quick and easy positioning on the included clip-on air track mount or on regular stand rods. All electronic functions are selected on the control box by a single press of a keypad. The memory feature allows successive measurements to be made in any mode, and to be recalled for later recording.Four modes are available:For Air Tracks: Gate & PulseFor other applications: Pendulum & ManualThe resolution of the measurement is selectable between 0.1ms for rapid measurements and 1ms for slower phenomena. System includes electronic timer, two dual-purpose gates, 9 VDC power supply, two stands to hold gates on air tracks, plus a detailed instruction manual.