Rio 2016
122 days
Pyeongchang 2018
-431 days
Tokyo 2020
-1327 days
This device mounted on a tripod is a vast improvement on the tapes and other measuring systems used in athletics that it replaced. The appliance has sighting device and measures distances by sending a luminous infra-red beam to a target point. The distance is calculated by measuring the time taken to get from one point to another. One second is sufficient to obtain a precise measurement, to within a millimetre.
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