http://cgi.ebay.co.uk/EMT-422-speed-measuring-unit-/320678457110?pt=UK_Consumer_VintageAudio_RL&hash=item4aa9ecef16
Perfect if you have 3.15Khz test tone on disc!
Excellent bit of kit, i would buy it if i didn't already own one
![Smile :)](./images/smilies/icon_smile.gif)
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