Refractometer

[betch]

I own a refractometer but do not know how to use for HB? Tonight i brewed a Maple Pumpkin Ale with OG of 1.061 and refractometer reading of 16.9.
How do I use it and why?

 

[Chairman Cheyco]

https://www.homebrewtalk.com/showthread.php?t=11707&highlight=refractometer

http://byo.com/feature/1132.html