Brand and high quality.Made of high-quality acrylic material, durable, firm and nonslip to use. Light and accurate, it can bring a good and wonderful calibration effect. It is a useful calibration distance gauge tool to adjust the vinyl records. Side A is used to the side sliding force of the stylus, Side B is used to calibrate the cartridge. Easy to use, one sided alignment mat provides a diagram for alignment. How to use: 1. Place the calibration disk on the vinyl turntable, move the cartridge to the R2 position, align the stylus with the center of the circle or the arc line, and adjust the angle of the cartridge so that the front edge of the cartridge is level with the horizontal line on the calibration disk. 2. Move the cartridge to the R1 position, calibrate the cartridge angle again, and check whether the front edge of the cartridge is level with the horizontal line on the calibration disk. 3. Repeat steps 1&2 if necessary. You only need to loosen the screws to move the cartridge. After the adjustment is completed, tighten the cartridge fixing screws. (Calibrate the R2 point so that the front edge of the cartridge is level with the OVER HANG horizontal line on the calibration disk.) Manual measurement, there may be slight errors, which will not affect the use Colour:White Material: Acrylic Size: Diameter: 300mm, Thickness: 3mm Package Contents: 1 x LP Vinyl Pickup Calibration 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.