brand new and high quality Introduction: Double-sided tachometer, one side is the speed measuring function, and the other side is the for head angle calibration function. Specially designed to detect the rotational speed of your for LP vinyl record and adjust the position of cartridge and stylus so that you can enjoy high quality sound. The essential adjustment tool for LP vinyl record amateurs, practical and versatile, convenient to debug the machine. Features: For LP vinyl record for head calibration and rotational speed detection. 33/45/78 RPM, 50/60Hz rotational speed detection and adjustment. Adopting nearly 180g disc thickness. Check and adjust the angle of the cartridge and stylus. Great well to check whether the rotational speed and angle your vinyl record is right or not. Designed for use in artificial light, it can also be used under domestic fluorescent lamps with ballasts. Place the disc on your platter, turn on your light and then adjust your turntable's speed control until the pattern on the disc doesn'for t move. Tachometer only, other accessories demo in the picture are not included! Tips: 1. The speedometer must be tested under 50Hz strobe light. 2. Cannot be used under DC-powered LED lights. Specification: Material: Plastic Type: Turntables Color: White Size: One Size Diameter: 29.7cm/ 11.69in Quantity: 1 Pc Note: 1.No retail package. 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Tachometer