@mulveling Sorry, but i don't understand why do we need that GeoDisc for $49 if almost the same
protractor comes for free with Analog Test LP for the same price?
This is Analog
Test LP and
free protractor inside. There are 3 different method on that protractor, one of them is
Linier Offset Technique with just one point for the stylus and a line accross the protractor to point it to the pivot of the arm (same as with GeoDisc). But for the same price ($49) we will get Test LP (to measure tonearm/cartridge resonance) and 2 additional alignment methods on that protractor.
This is
GeoDisc with just one alignment method for $49
And this is
Dr.Feickert which is a much better, made of metal (not plastic) with many more features such as Stevenson, Baerwald, Lofgren methods, and more important - Precision Pivot to Spindle Ruler on it. All these for $185 (without VAT if you're not in UK or EU).