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suitable for KS4+. This is a precision digital timer used to measure the time interval between any two events with high accuracy. The timer standard accuracy has been achieved using the 10MHz Quartz Crystal Oscillator. The timer has four operating modes: Manual, Freefall mode, Timing Gates mode and any other triggering start and stop. The timer has a built in power source. Display: 14mm LED. The pair of timing gates is housed in tough moulded cases giving excellent durability. The lamps operate on 6 volts. A special built-in circuit prevents lamps from damage in case higher voltage is accidentally applied. The timing gates can be connected by 4mm sockets to a timer and power supply. Also works in conjunction with the Eisco g by Free Fall apparatus (code 0946).