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You apply your face creams, oils and serums every day, but how do you know if they’re actually moisturizing your skin? Enter, the Wayskin Device—a handy tool that tests just how well hydrated your skin really is through an app on your phone.

Watch our senior beauty editor Jenny Jin put her own face to the test while she explains (with a mini science lesson) how this skin-care-changing tech works. 

RELATED: From Ragged Cuticles to Elephant Elbows, Here’s the Best Way to Moisturize Everything This Winter

Additional Reporting by Abby Hepworth

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