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The sensor measures just 2 sq mm and weighs 1.6mg.

The company says the XMM 6255, with an area of about 300 sq mm, is the world's smallest modem.

The implant is a wirelessly controlled chip about 9 sq. mm that is implanted directly beneath the retina.

As the thickness of the samples to be tested will vary, it is advisable to cut the strips of such a width that the cross-sectional area of all test pieces is the same—say, 40 sq. mm.