HIGH DEFINITIONS, high transparency, easy to use. Purpose: Used to adjust the azimuth angle (Azimuth) of the LP vinyl record player and the balance of the TONES arm VTA. Azimuth simple adjustment method: move the cartridge to the middle of the record, lower the tonearm, make the stylus fall on the record, put the adjustment ruler in front of the cartridge, look at the vertical line between the stylus and the grid Align and overlap, and see whether the outer contour of the cartridge is aligned with the grid line (the cartridge with irregular contour is estimated to be aligned with the grid line, and the ratio is uniform). Move the cartridge to the middle of the record, lower the tonearm, make the stylus fall on the record, place the adjustment ruler on the side of the tonearm, check whether the tonearm is parallel to the horizontal line of the adjustment ruler, if not, adjust the VTA (That is, adjust the height of the TONES arm). Specification: Material: Imported high-quality acrylic Colour: Transparent Size Chart: Size: 72x45x10mm/2.83x1.77x0.39inch Package Includes: 1PC X Alignment Ruler Headshell Block Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!