Pro-Ject Strobe-it
Disco estroboscópico para afinação de rotações nos giradiscos.
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Descrição
Stroboscopic Measure Tool for Turntables very simple very helpfull
The strobeit has two functions
1 It allows you to check the correct speed of your turntable In case you have a Project speedbox SE you can adjust a speed error 
2 On the back of the strobeit you find a tool to adjust the position of your cartridge in the headshell