Which tool is most commonly used to assess skin moisture levels?

The skin analyzer or moisture meter is the most commonly used tool for assessing skin moisture levels because it specifically measures the hydration levels within the skin. These devices utilize various technologies, such as electrical resistance or capacitance, to determine how much moisture is present. This accurate measurement helps estheticians evaluate the skin's condition and tailor treatments accordingly.

While a facial steamer can help hydrate and prepped skin for treatments, it doesn’t assess moisture levels. A Wood's lamp is used for diagnosing skin conditions by revealing pigmentation and other skin issues under ultraviolet light rather than measuring moisture content. A microscope can provide a close examination of the skin's surface, but it does not specifically measure moisture levels either. Thus, the skin analyzer or moisture meter is the most precise and relevant tool for monitoring hydration.