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 Denon tonearms:
DA-303
DA-305
DA-307
DA-309
DA-401
The geometric features are compliant with Denon specifications; see the first picture.
 
It is supplied with detailed instructions.
We also make custom protractors to the client's specifications.