For sale, a high precision arc protractor for cartridge alignment.
This protractor is made of 3mm High Glossy Black Acrylic Perspex, high-precision laser cut and engraved.
The arc protractor is the most accurate protractors for cartridge alignment; this one is designed for the following Audio-Technica tonearms:
AT-1503III
AT-1503IIIA
AT-1503IV
ATP-12T
The geometric features are compliant with Audio-Technica specifications; see the first picture.
 
It is supplied with detailed instructions.
We also make custom protractors to the client's specifications.