HD VTA Balance and Azimuth Adjustment Ruler Product Specification: Features: High definition, high transparency, easy to use Purpose: Used to adjust the azimuth of the LP vinyl phonograph and the VTA balance of the singing arm Material: Acrylic Color as shown Usage: (Warm tips: please pay attention that the phonograph cannot rotate during adjustment!) Easy Azimuth Adjustment: Move the head to the center of the record, lower the arm, and let the stylus fall onto the record. Place the adjustment ruler in front of the head to see if the head is aligned with the vertical line in the center of the grid, and if the outer contour of the head is aligned with the grid line (for heads with irregular contours, estimate if it aligns with the grid line, and ensure the proportion is even). How to Use VTA Balance on Singing Arm: Move the head to the center of the record, lower the arm, and let the needle fall onto the record. Place the adjustment ruler on the side of the arm to see if the arm is parallel to the horizontal line on the adjustment ruler. If not, adjust the VTA (adjust the arm height). Package Contents: 1 x VTA Balance for Singing Arm 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 to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.