Description: 【 Design】: This speed test disk is specially designed for checking the rotation speed of vinyl records. It has two gears, 45 (inner rings) and 33 (outer rings), suitable for most gramophones on the market. 【Premium Material】: This phonograph calibration tool is made of premium and reliable acrylic material for long term use. 【Precision Test】: phonograph test disc calibration can accurately test your turntable speed and adjust the overshoot of the to ensure the best performance. 【Essential Tool】: This is an indispensable tool for playing vinyl records, premium for audiophiles who want to get the best sound from their records. 【Product Specifications】: Turntable stylus tuning disc size is approximately 8cm/3.15inch in diameter and approximately 0.75cm/0.30inch thick. Specification: Material:Acrylic Size Chart: Diameter:Approx.8cm/3.15inch Thickness:Approx.0.75cm/0.30inch   Package Includes: 1 Vinyl Tachometer Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on line shopping!