File:Scratch sensor kit2.jpg

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Scratch_sensor_kit2.jpg(550 × 445 pixels, file size: 82 KB, MIME type: image/jpeg)

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current08:48, 1 September 2014Thumbnail for version as of 08:48, 1 September 2014550 × 445 (82 KB)Qian.zhang (talk | contribs)
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