Do you always feel distressed when you go to a professional repair shop because your Phonograph Needle is inaccurate? Do you want a more 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:As Shown -Material:Acrylic -Size:8.00X8.00X0.70cm/3.14X3.14X0.28in -No need to go to a professional repair shop, you can solve it by yourself, saving time and effort. -The operation method is simple, even the first time you can learn it right. -High performance and high accuracy ensure its practicality and popularity. -Simple color matching makes it both practical and beautiful. Check and adjust the Angle of the barrel and needle. -A great tool to check whether the and Angle of your vinyl record is correct, high precision detection anti-slip gauge, use super good results Package list: 5 x Stroboscope Disc