L'Oreal's UV Sense Doubles As Sun Exposure Monitor, Thumbnail Art

Measuring less than 2mm thick and 9mm in diameter, UV Sense is intended to be worn on a user’s thumbnail for up to two weeks at a time, relaying UV exposure measurements to a companion app that organizes the data and offers protective care recommendations. The device will launch from La Roche-Posay on a limited basis in the US this summer.