100% new and high quality 1. Place the protractor on the turntable plate with the hole in the spindle. 2. Move the cartridge/tonearm until the stylus is exactly in the center of the bullseye. . Check that the cartridge is square to the outer set of grid lines. - If not, loosen the cartridge mounting screws and gently twist the cartridge until it forms a square shape. 3. Move the cartridge/tonearm until the stylus is exactly centered on the inner bullseye, pivoting the protractor as necessary. Check that the cartridge is square to the inner set of grid lines. - If not, change the overhang (move the cartridge in or out along the axis) until the cartridge is square. 4. Repeat steps 2 and 3 until the cartridge is square at both points. Tighten the installation and recheck as above. Remove the protractor. Relax and enjoy! High-contrast cartridge alignment protractor improves visibility and eliminates errors. Avoid overshoot distortion to maintain high-quality sound Link to the turntable setup guide with instructions printed directly on the protractor. Material: Plastic color: White Package Contents: 1 x stylus alignment protractor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.