always feel distressed when you go to a professional repair shop because your stylus is inaccurate? want repair method? Then buy our calibration disk? Its operation method is very simple, precise and professional. Features -Color:As Shown -Material:Acrylic -Size:30.00X30.00X0.30cm/11.79X11.79X0.12in - Anti-sliding Gauge Ruler made with fine workmanship, to ensure the practicality and durability. - Calibration and velocity detection for vinyl record heads. Check and adjust the angle of cylinder and needle. - Durable, firm and nonslip. Light and accurate, it can bring a good and wonderful calibration effect. - A must-have item for vinyl record and a good housewarming present for friends. - A great tool to check if the rotation velocity and angle of your vinyl record is correct, high precision test anti-skid gauge ruler, use super good results. Package list: 1 x vinyl record calibration plate