Do you like listening to vinyl records? Do you have a vintage and record player in your house? If so, you can consider our product, a professional calibration disc. Under long-term use, the stylus will inevitably have errors. Our calibration disc can help you quickly adjust the stylus and improve your quality of life. Features -Color: White -Material: Acrylic -Size: About 30.20X30.20X0.25cm/11.87X11.87X0.10inch -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. -Double-sided design to meet your long-term use needs. Package list: 1 x vinyl record needle calibration disc