Angle Protractor - Octoprint Bed Leveling Nylock or Silicone Mod

I was got tired of guessing in error a few times which cost me a bunch more time. 

Printed with a filament change at 1mm

Reading degrees;

3 lines closest to hole are 45 deg sequencing 0, 45 & 90

8 Hollow lines are in 10 deg increments, using the main 45 deg line as 0 & 90

8 Black lines towards the outer edge are in 5 deg increments, using the 45 deg and 10 deg markers for each 5 deg step