Dr. Feickert is the best, buy it and forget about everything esle.
It will give you 3 alignment methods (Baerwald, Lofgren, Stevenson) and it will last forever on any turntable and any tonearm so you don’t have to worry about alignment in the future even if you will change turntable or tonearm.
PS ruler is very important, Feickert has it.
Search for used sample if new one is too expensive for you.
This is German quality.
P.S. if you want something very simple and very cheap you will get protractor for free inside Hi-Fi Test LP which is a must have test record.
It will give you 3 alignment methods (Baerwald, Lofgren, Stevenson) and it will last forever on any turntable and any tonearm so you don’t have to worry about alignment in the future even if you will change turntable or tonearm.
PS ruler is very important, Feickert has it.
Search for used sample if new one is too expensive for you.
This is German quality.
P.S. if you want something very simple and very cheap you will get protractor for free inside Hi-Fi Test LP which is a must have test record.