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"With a read-head as small as 6.7 \u00D7 12.7 \u00D7 20.5 mm, Renishaw\u2019s Atom non-contact optical linear and rotary incremental encoder system uses filtering optics with auto gain control (AGC) and auto offset control (AOC) for high signal stability and dirt immunity."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/products/miniature-optical-encoder-promotes-signal-stability(3)>