The Pro-Ject Strobe It - Turntable Speed Adjustment Tool is designed to adjust your turntable's rotation speed to a precise and accurate level. On one side of the bearing adjustment tool you will find an alignment jig for aligning your turntable’s cartridge into the right position for reduced tracking distortion. This tool provides clear cartridge alignment markings to accurately align your cartridge, providing the best possible sound from your turntable. It offers an easy way to ensure you also get the best overall performance from your record collection. This bearing adjustment tool provides an efficient and highly-accurate way confirm your turntable is spinning at a proper speed. To process is easy, you just place the device on your platter and follow the instructions for optimal speed improvement. You can also use the diagram on the opposite side of the Strobe It for easy cartridge alignment.