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L’Oreal and John Rogers built a sticker to measure skin pH

My Skin Track pH will let you know what skincare products you need to buy (from L'Oreal, of course).
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Daniel Cooper / Engadget

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The fruitful partnership between cosmetics giant L'Oreal and wearable pioneer Professor John Rogers has produced a new sensor for 2019. My Skin Track pH by La Roche-Posay is a wearable sensor, smaller than a Band Aid, that monitors your skin's hydration levels.

Gallery: L'Oreal My Skin Track pH | 6 Photos

Healthy skin is meant to have a pH between 4.5 and 5.5, making it slightly acidic, and if you're out of range, it's a problem. According to the company, a compromised pH balance can trigger "inflammatory responses," including "dryness, eczema and atopic dermatitis."

Slap the My Skin Track patch onto your forearm, and you'll be able to learn how acidic (or alkaline) your epidermis is within 15 minutes. And, while other systems have been able to do this before, including the donut-shaped Way which we saw in 2015, none can do it so easily, and with such a small volume of sweat.

Once the 15 minutes have elapsed, users need to open the companion app and shoot a picture of the sticker. The dyes inside the device will have changed color, which can be interpreted by the app to give you a picture of your skin health.

Naturally, once you know the situation, you'll be recommended a series of L'Oreal and / or La Roche-Posay products to buy. And, should you want to try one of these, you'll need to buddy up with a La Roche-Posay dermatologist in the US, who will be testing the product before a wider commercial release.

Meanwhile, the My Skin Track UV sensor, shown off this time last year, is now available to buy in Apple stores and on the Apple website for $60.

Follow all the latest news from CES 2019 here!

All products recommended by Engadget are selected by our editorial team, independent of our parent company. Some of our stories include affiliate links. If you buy something through one of these links, we may earn an affiliate commission.

After training to be an intellectual property lawyer, Dan abandoned a promising career in financial services to sit at home and play with gadgets. He lives in Norwich, U.K., with his wife, his books and far too many opinions on British TV comedy. One day, if he's very, very lucky, he'll live out his dream to become the executive producer of Doctor Who before retiring to Radio 4.

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