Regulation distance measuring device for e.g. football match, has alert unit to indicate that distance measured by distance meter is situated in distance range including distance, or lesser or greater than range

摘要

The device has an alert unit that indicates to a referee that a distance measured by a distance meter is situated in a distance range including a regulation distance or is lesser than the lowest value of the distance range or is greater than the largest value of the distance range. Yellow or red or green indicator is put on when the measured length is less than or greater than or equal to nine meters respectively.