I've thought for a while that the easiest way to do it would be to put a laser on/embedded in the first down marker and then just flip it on to measure across rather than trot the chains out.
Keep a square on the base of the marker to assure it's not angled toward an end zone and put a template or something (could be something carried by the referee) to account for the crown of the field (which I believe is about 18").
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