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:Plastic -Size:8.00X8.00X0.77cm/3.14X3.14X0.30in - The scale on the calibration disc is clear and clear, helping you quickly identify the result of the stylus offset. - Made of plastic, wear-resistant and durable, can meet your basic needs. Edges are sanded smooth and won't hurt your hands. - Whether it is adjusted or used in a repair shop, it is a perfect and tool. - You can give it to friends who like to listen to vinyl records, they will like it very much. - designed for vinyl record head calibration and rotational speed detection. Package list: 1 x stroboscope disc