The Unilab Fast Timer is a versatile, portable instrument for timing brief events with two ranges: 1 to 999.9ms and 1 to 9999µs. The inputs can be controlled by light gates, microphones or mechanical switches, connected via 4mm sockets. Two sockets provide 0 and 5V for connection to sensors if required. The usual care is needed when using microphones to ensure that a repeatable sharp sound is obtained, e.g. use a toffee hammer and steel slab to produce a sharp noise when measuring the speed of sound. Mass: 0.5kg. Dimensions: 170mm x 135mm x 45mm. Associated Products:. B8L86356 - Unilab Master Light Gate, with Leads. B8H27623 - Unilab Slave Light Gate. The Unilab Fast Timer is also available to purchase as a bundle with our 'g' by Freefall Apparatus (B8R06831).