Witty - Extra DOUBLE BEAM intermediate gate kit

Extra double-beam intermediate gate kit for the Microgate Witty system.

This kit upgrades an existing Witty Start/Stop (2-gate) system into a 3-gate double-beam system. Add a double-beam intermediate gate to measure split times during interval or shuttle runs. The double-beam (stacked photocell) gate generates a signal only when both beams are interrupted at the same time, helping ensure timing is triggered by the athlete's chest rather than a leading arm or leg.