Feature:1. Professional : Specially designed to detect the speed of LP vinyl records and adjust the position of the cartridge and stylus so that you can enjoy high quality sound.2. Speed Adjustment: The speed of this vinyl record player calibration strobe disc can be 33, 45, 78 RPM, with 50 or 60Hz frequency speed detection and adjustment.3. Double Sided Tachometer: One side of this vinyl record player's calibration strobe disc is the speed measurement function, and the other side is the head angle calibration function.4. Practical: This vinyl calibration strobe disc is a necessary adjustment tool for LP vinyl record lovers. It is practical and versatile, and it is convenient to debug the machine.5. Simple Operation : Put the record on the plate, turn on the light, and then adjust the speed control of the turntable until the pattern on the disc does not move.Specification:Item Type:Turntable Stroboscope DiscMaterial: ABSColor: Black and WhiteFunction: One side is the speed measurement function, the other side is the head angle calibration functionSpeed: 33 or 45 or 78 RPM50 or 60HzScope of Application: Suitable for Vinyl Record Players.Package List:1 x Turntable StrobeNote:1. The speedometer must be tested under a 50Hz strobe light.2. It cannot be used under DC powered LED lights.