like listening to vinyl records? have a vintage and record player in your house? , you can consider our product, a calibration disc. Under long-term use, the Phonograph Needle will inevitably have errors. Our calibration disc can help you quickly adjust the Phonograph Needle and improve your of vinyl records. Features -Color:White -Material:Acrylic -Size:7.80X7.80X0.80cm/3.07X3.07X0.31in -No need to go to a repair shop, you can by yourself, saving . -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: 1 x stroboscope disc