Features:1. High contrast cartridge alignment protractor provides improved visibility for cartridge alignment and eliminate tracking errors, which will avoid the overimpactsz distortion to keep quality sound, and the calibration protractor link to turntable setup guide with instructions printed on the protractor2. This measuring ruler is a transparent green crystal, which allows you to read easier and quicker, adopts the clear acrylic with crystal clear print, nice precision craft with high definition, easy to use and handle, fits for most phonograph3. Calibration protractor and VTA ruler are made from acrylic material, practical and durable, the coating of alignment ruler delivers outstanding abrasion, scratch and chemical resistance for better accuracy alignment, no magnetic field adhesivity, reading reliable4. Suitable for most occasions, calibration protractor works with an S -Shaped arm and any 1,2" mounted cartridge, headshell alignment blocks are suitable for electrical repair shops or individuals, professional phonograph horizontal measurement device, very practical5. Include one magnifier to make you more clear when adjusting the overhangNotice:Actual color may be slightly different from the image due to different monitor and light effectPlease allow 1-3cm deviation due to manual measurement1. Material: imported high-quality acrylic, net weight 29G, gross weight 30G2. Size: 66mm*48mm*8mm (thickness) 3. Features: high definition, high transparency, easy to use 4. Purpose: Used to adjust the azimuth angle (Azimuth) of the vinyl record player and the balance of the tone arm VTA. 5. Usage: (Reminder: pay attention to the turntable not in the rotating state when adjusting) 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 grids Align and overlap, and see if the outer contour of the cartridge is aligned with the grids line (the irregular contour of the cartridge is estimated to be aligned with the grids line, even in proportion); Tonearm VTA balance method:move the cartridge to the middle of the record , Put down the tonearm, make the stylus fall on the record, put the adjustment ruler on the side of the tonearm to see if the tonearm is parallel to the horizontal line of the adjustment ruler, if not, adjust the VTA (that is, adjust the height of the tonearm) includes:1 x Protractor VTA"