The 60 meter 10% distance in particular is not accurate. Tourney greens 1.3 X 60 = 7.8 yards. I have had about 5 putts not go more 6.
I have made sure that there was no hidden elevation of the green becoming blue. I just had a flat 7ft putt that I hit 12.5% = 9.75 yards to compensate and it went 5.6 yards. : (
The meter is closer to a 50 scale.