Are you referring to just putts or all shots in general? For putting, I find that half of the meter is pretty accurate when trying to obtain half the distance, but for irons, this is not always true. It seems to me that if i use 50% the meter on iron shots, I obtain less than half the distance, but if i use around 75% or more, the percentage is accurate. What i do is select a club as near as possible to the actual distance and just let off a little bit(just as in real golf).