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 turntables:
 
DP-7F
DP-11F
DP-12F
DP-15F
DP-21F
DP-23F
DP-30L
DP-31L
DP-31F
DP-32F
DP-33F
 
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.