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3D3DComplete gyroscope module.
This is the complete unit that contains one of the beryllium spheres pictured above: It's a fabulous bit of machining, I just wish I could figure out how to take it apart without breaking something.
Source: eBay seller parker282828
Contributor: Theodore Gray
Acquired: 15 June, 2004
Text Updated: 18 October, 2009
Price: $70
Size: 2.5"
Purity: 90%