Item Type:Turntable Stroboscope Disc Material: ABS Color: Black and White Function: One side is the speed measurement function, the other side is the head angle calibration function Speed: 33/45/78 RPM50/60Hz Scope of Application: Suitable for Vinyl Record Players1Professional : 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. 2Speed 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. 3Double 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. 4Practical: 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. 5Simple 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.1. The speedometer must be tested under a 50Hz strobe light. 2. It cannot be used under DC powered LED lights.1 x Turntable Strobe