tool to measure the degree of a neck pocket?

[jonn]

hey i building a les paul and was told i need a 3 degree angled neck pocket, this is my first build and was wondering what tool to use

 

[AutoBat]

are you making this body from scratch?
what bridge will be on it?
any other information you could give would be appreciated.
pictures are always valuable.

 

[DangerousR6]

An adjustable combination square, or a protractor...