Players who join a Country Club which is higher than level 4, all get the free Shot Pal meter bar and a free Putter-Pal meter bar and both of these are marked into 10 segments. So that if your your Putter-Pal meter is say 20 feet of power for instance, then the 5th line along ....the half way mark .....will give you 50% of power which is 10 feet if you manage to click on it as power meter comes back toward the ding line.
Of course some players here are not in a Country Club so they make their own power meter scale / gauges. Just take a thin strip of card or paper and cut it to the exact length of the power bar.
Then mark that strip of paper with 10 lines l l l l l l l l l l then tape that strip of paper below the power bar on your screen or monitor. Obviously the first line will be 10% power, 2nd line will be 20% power, 3rd line 30% power etc....like 2 feet, 4 feet and 6 feet and so forth on a 20 feet scale right up to the final line of 100% power on a 20 feet scale.
Hope that helps you