I've been using this putter ruler for a long time and as soon as i started using it , it improved my putts.
I used to use the increment method.
WGT has needed a measure on the swing meter since day 1. The current offering of Putter Pal (for credits lol) is pretty lame. Other golf games increment their swing meters, why not WGT? oh yeah.. so they can sell one.
I think its a no brainer to realise this as a 'ruler' does not take away the need for working out your wind, lie & final putt
distance yourself, this will not calculate the distance of the
putt for you or your aim....
it will simply give you the mark on the swing meter you need to finally hit
although THIS will help calculate your distance on various greens:
Right click and 'view image', then, right click and 'save Image'

And although this is a complex chart, you really only need to know the Divisor shown for each green speed.
eg;
Standard 1.0,
Fast 1.1,
V Fast 1.2,
Tournament 1.3
etc