With the Oehlbach Speed Check Stroboscope Disc you get an exact tool to check the platter speed of your turntable and tune it to maximum sound. A speed Check is very easy to perform under lighting with 50 or 60 Hz mains frequency. The exact scaling on the Oehlbach Speed Check Stroboscope Disc shows you immediately and reliably whether the turntable of your turntable always maintains the respective speed of 331/3, 45 or even 75 revolutions per minute.