[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 calibration and speed detection of LP records.Function: For 33RPM 45RPM Turntable Rotation Speed DetectionDiameter: . 80mm / 3.1inch Thickness: .7.7mm / 0.3inchProduct Type: Turntable StrobeColour:WhiteMaterial:AcrylicPackage Contents:1 x Calibration TachometerOnly 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.