When I bought the Acoustical Systems UNI protractor years ago, I didn't realize it is the best investment I've made.  
We have setup more than 500+ tables with this setup tool, and it never seizes to amaze me how easy yet accurate it can be with the UNI protractor. 

Here is a new Oracle Paris turntable with Origin Live tonearm and Phasemation cartridge we setup for a customer.