The Speed Strobe Test LP goes hand in hand with the Clearaudio Speed Strobe Light. Together, they accurately measure the speed of your turntable.
“[Clearaudio’s Speed Strobe Kit], a two-sided white strobe disc, with markings for calibrating both 33 and 45 speeds, as well as a special groove that allows you to break in a cartridge. Shine the [Speed Strobe Light’s] little blue light on the disc, and, voila, speed can easily be calibrated. The Clearaudio Speed Test Disc and Speed Laser have become part of our reference accessories list. And much welcomed!” – Harry Pearson, The Absolute Sound