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LP Vinyl Turntables Record Speed Test Calibration Disc Measurement 33/45 Features: This speed test disk is specially designed to detect the rotation speed of LP vinyl record. 45 rpm (inner rings) and 33 rpm (outer rings), two speed gear are suitable for most phonographs on market; Made of acrylic material, it is durable, reliable, high quality and high precision. It can test whether the speed of the turntables is accurate, debugs the overshoot of the cartridge. It is an indispensable debugging tool for playing LP vinyl record players. Specifications: Material:Acrylic Color:White Diameter:Approx.80mm/3.15in. Thickness:Approx.7.5mm/0.3in |