The DSI Sense (purchased separately) monitors the drying stresses on skin due to changes in indoor temperature and humidity.
Two diagnostics are used to measure these stresses:
(1) the Dry Skin Index, based on a thermodynamic property of water vapor, and
(2) hydration of the outer layer of the Stratum Corneum, calculated from relative humidity.
Why are these parameters important?
You cannot really sense the magnitude of drying stresses on your skin and thus many people around the world are afflicted by seasonal dry skin since they dont have the information to prevent or manage it.
But with the new DSI Sense device and app, people for the first time will have the ability to monitor those stressors and then respond with the appropriate skin-care options, including:
(1) the timely application of moisturizing creams and lotions to help prevent the formation of dry skin
(2) operation of a room humidifier to reduce drying stresses.