According to a recently-published patent, it seems that Apple has filed for a patent for a hydration measurement feature that could be used in the Apple Watch.
The patent’s description reads, “Hydration measurement capabilities can be provided by a wearable electronic device, such as a watch, to allow a user to easily track hydration. A watch can be positioned to receive and measure one or more electrical properties of perspiration produced by the user wearing the watch. The watch provides electrodes for measuring the electrical properties of the perspiration.”
Apple also adds, “The hydration tracking can be performed non-invasively, repeatedly, accurately, automatically, and with minimal user intervention. The measurements can be used to provide useful feedback and health tracking information to a user, thereby allowing the user to better manage hydration and overall health.”
However, as this is a patent, there’s no telling if Apple will actually make it a reality. There have been rumors that Apple is considering other types of health sensors and monitors, like a noninvasive way of measuring glucose levels, but it might be a while before we actually see that feature make its way into the Apple Watch.