L’Oreal launches its My Skin Track pH, which measures a person’s pH levels on the skin by placing one of the wearable patches for 15 minutes at the Sands Expo and Convention Center during CES in L …

L’Oreal launches its My Skin Track pH, which measures a person’s pH levels on the skin by placing one of the wearable patches for 15 minutes at the Sands Expo and Convention Center during CES in Las Vegas, Tuesday, Jan. 8, 2019. Caroline Brehman/Las Vegas Review-Journal