Vibrations from a smartphone might help us spot unsafe drinking water

The vibrations from an iPhone’s ringtone can be used to measure the viscosity of a liquid, that could allow it to identify whether water is polluted or to test for kidney conditions and pregnancy by measuring the levels of protein or hormones in urine.

Yandao Huang at Shenzhen University in China and his colleagues built a 3D-printed cup with a mount on the outside made to securely hold an iPhone 7. Then they used the phone’s vibrating motor to agitate dozens …

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