We have never discussed whether using range finders is allowed or not. The matches are usually played in good spirit, with the main theme being to have fun. I always thought in such matches, that using distance measuring devices was takling it a bit too seriously. Especially as it gave the wrong info, or none at all. Maybe in better hands it would have been ok, but he was rubbish at using it, and for a 12 handicap golfer, not that good.