Features: high definition, high transparency, easy to use Purpose: Adjust the azimuth of LP vinyl phonograph and VTA balance of singing arm Usage : Adjusting the azimuth of the : move the 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 to see whether the is aligned with the vertical line in the middle of the grid, and whether the outer contour of the is aligned with the grid line (for the with irregular contour, it is estimated whether it is aligned with the grid line, and the proportion is uniform) How to use VTA balance of singing arm: Move the 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) Colour:Transparent+Green Material:Acrylic Package Contents: 1 x Tone Arm VTA Alignment Block 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.