33-1/3,45,78rpm Calibration Turntabl Stroboscopic Strobe Light+Tachometer Disc h
1 Strobe light. Test turntable platter speed. Tests 33-1/3 rpm, 45 rpm, and 78 rpm speeds. Designed for use in artificial light, the disc's pattern will appear to be static when the turntable's speed is correct.