For sale, a high-precision arc protractor for cartridge alignment.
This protractor is made of 3mm high-quality acrylic, coated with a yellow film, and high-precision laser-cut and engraved.
The first picture is for reference only; the real protractor looks like the one in the second and third pictures.
 
The arc protractor is the most accurate protractor for cartridge alignment; this one is designed for the following Grace tonearms:
 
G-545F
G-640P
G-704
G-707
G-714
G-727
G-840
G-940
G-1040
 
The geometric features are compliant with Grace specifications; see the first picture.
 
It is supplied with detailed instructions.
We also make custom protractors to the client's specifications.