Measuring Vibration in Equipment


There are alot of threads on shelf material and tweeks that cut down on vibration. Is there a device that measures this vibration? I think I remember of hearing of such a tool before my audiophile days for testing crates for shipment but I cant remember what it was called. In The Complete guide to Home Audio they suggested using a stethescope. Has anyone tried this?
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I used a stethoscope to listen to the walls while I played a test disc of the different frequencies through my system to hear where the most vibration is at what frequencies. Works pretty well to identify trouble spots to treat.
Never used it on racks, etc. though.