Are you serious about shooting lower scores?  Then I believe you need some real data on your performance.
The best way to do that is by using a Shot Scope product with “Shot Tracking”.
There’s nothing else in the golf market at a comparable price that tracks your data for you whilst you play.  I personally use the H4 Handheld but even more popular is the V3 Watch.  These products are GPS devices with all the important front, middle, back of green yardages and distances to hazards.  Plus you attach tags to your golf clubs so the data is collected.  Then you can properly analyse your game rather than guess where you are leaking shots.
Shot Scope also do Rangefinders and have an all-in-one product of Rangefinder, GPS and Shot Tracking;  the PRO LX+
Click the button below to browse Shot Scope’s amazing products.  Not interested in the data?  You can simply purchase a stand alone Rangefinder or GPS product.  I do advise the Shot Tracking devices however. 
To get a further 15% off any product on their website use the code ROSSPUTT. This code even works on sale products!  And there is a sale on now!
Don’t forget to use the code ROSSPUTT for that extra 15% off