Another thing to look out for when putting or hitting approaches/tee shots is the Notepad.
Say you're on a green & looking at a particular putt & say you're getting conflicting reads but you've a note on the putt, lets say something like "Reverse View the true break" or something like that.
Well if you scroll through your notes it also scrolls through your Putter Scales at the same time so you might intend to hit a short/mid range putt with your 10/15, 20/30 Scale that you selected before you opened your Notebook but be careful when you close your Notepad you're Putter Scale could now be set to 300!
Ken