[Acrylic Material] Made of high-quality acrylic material, the turntable record disc is sturdy, heat-resistant, and offers a long service life. [Convenient to Use] The LP record tachometer is reliable and accurate, ensuring proper calibration without affecting the operation of the record player. [Record Calibration] This calibration strobe disc is an essential adjustment tool for LP record enthusiasts, offering practical and versatile functionality. [Easy to Operate] Place the record on the turntable, turn on the light, and adjust the turntable speed until the pattern on the disc appears stationary. [Main Function] Compact and functional, this turntable strobe disc is designed for calibration and speed verification of LP records. Function: For 33 RPM and 45 RPM turntable rotation speed detection Diameter: 80 mm / 3.1 inches Thickness: 7.7 mm / 0.3 inches Product Type: Turntable Strobe Disc Color: White Material: Acrylic Package Contents: 1 x Calibration Tachometer Note: Light reflection and differences in display screens may cause slight variations in the color shown in the image compared to the actual product. Measurement error allowance is +/- 1-3 cm.