Feickert is fine for your needs. But so too are many other choices. By the way, the 223.5mm and 215mm parameters are the pivot to spindle distances recommended for your two tonearms, not their "effective length". Effective length = pivot to spindle distance + overhang.
How to choose the right protractor for my effective tonearm length
Hi, I have 2 turntables that I want to align correctly. TT-1 has an effective tonearm length of 223.5mm and 19mm overhang, and TT-2 has an effective tonearm length of 215mm and 15mm overhang. I currently have a Baerwald standard protractor that was made in Great Britain. It says the Vinyl source on it. And have a basic mirrored Stevenson protractor. Please I need help. Thanks!