Google "Protractor" We need to know your needs before we can suggest an appropriate device.
Never saw that one before, Aaron. It looks like it could be useful, and is cheap, though plastic...I've got one like Bob posted, also got one of these.
https://www.homedepot.com/p/Empire-...PIPHorizontal2_rr-_-203219287-_-202035328-_-N
Honestly I haven't done much with either of them but they are cheap.