Now you can easily detect whether your milk has gone sour thanks to the smart chip developed by Boffins. The device will be sensitive to the thickness of the container's contents, and when it passes by the cashier's scanner it will begin to vibrate. If the content is very thick, the vibration will be slower than expected and visa versa. Any detection of irregular speed vibrations will lead to an alarm being set off at the checkout, saving you cash and hassle.

The detectors are to cost about a penny a carton, and they will have a wider implementation than just milk should initial tests work out well.

Via - Gizmodo