The Pro-Ject Strobe-IT Stroboscope is an essential tool for turntable enthusiasts functioning as both a speed-checker & a cartridge alignment tool. Cleverly designed it features circularly arranged dashes that represent the speed & frequency of your turntable. Simple enough to use simply lay the Strobe-IT on your turntable platter align a mains-powered light source directly to your turntable & turn it on until the speed of the Stroboscope is static. Perfect for calibrating the speed of your turntable you can ensure that your music playback will be perfectly in sync with your vinyl for the best possible listening experience.