Do you always feel distressed when you go to a professional repair shop because your Phonograph Needle is inaccurate? Do you want repair method? Then buy our calibration disc? Its operation method is very simple, precise and professional. Even at home, you can easily solve the problem of stylus inaccuracy by yourself. Features -Color:White -Material:Acrylic -Size:8.00X8.00X0.70cm/3.14X3.14X0.28in - The scale on the calibration disc is clear and clear, helping you quickly identify the result of the stylus offset. - Made of acrylic, wear-resistant and durable, can meet your basic needs. Edges are sanded smooth and won't hurt your hands. - Whether it is adjusted at home or used in a professional repair shop, it is a perfect and professional tool. - You can give it to friends who like to listen to vinyl records, they will like it very much. - Professional designed for vinyl record head calibration and rotational speed detection. Package list: 1 x Stroboscope Disc