1. Features: High definition, high transparency, easy to use 2. Purpose: Adjust the azimuth of LP vinyl phonograph and VTA balance of tone arm 3. Usage - Adjusting the azimuth: Move the turntable to the middle of the record, lower the arm, and make the stylus fall on the record. Place the adjusting ruler in front of the tone arm to see whether the stylus is aligned with the vertical line in the middle of the grid, and whether the outer contour of the stylus is aligned with the grid line (for stylus with irregular contour, estimate alignment with the grid line and ensure uniform proportion) 4. Usage - Adjusting VTA balance of tone arm: Move the turntable to the middle of the record, put down the arm and make the needle fall on the record. Place the adjusting ruler on the side of the arm to see if the arm is parallel to the horizontal line of the adjusting ruler. If not, adjust VTA (adjust the height of the arm) 5. Color: Transparent + Green 6. Material: Acrylic 7. Package Contents: 1 x Tone Arm VTA Alignment Block 8. Only the above package content, other products are not included 9. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm