[Acrylic Material] Made of superior acrylic material, the turntable record disc is sturdy, heat- and has a long service life. [Convenient to Use]The LP record tachometer is and accurate, ensuring good calibration without affecting the use of the record player. [Record Calibration] This calibration strobe disc is an essential adjustment tool for LP record enthusiasts, and is highly practical and versatile. [Easy to operate]Place the record on the disc, turn on the light, and adjust the turntable speed until the pattern on the disc stops moving. [Main Function]Compact and practical, this turntable strobe disc is mainly used for head calibration and speed detection of LP records. Function: For 33RPM 45RPM Turntable Rotation Speed Detection Diameter: . 80mm / 3.1inch Thickness: .7.7mm / 0.3inch Product Type: Turntable Strobe Colour:White Material:Acrylic Package Contents: 1 x Calibration Tachometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.