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 SME 309 tonearm.
 
The geometric features are compliant with SME specifications; see the first picture.
It is supplied with detailed instructions.
We also make custom protractors to the client's specifications.