gojcus

Hello! I'm working on a project about body/skin de/hydration. I'm interested if there is already a known technique or technology with which we could measure body/skin de/hydration in a simple/easy and quick way? I know that there are already certain techniques/technologies which are measuring de/hydration, (for example urine and blood tissue testing), but I would like to know if there is a faster and more simple technique/technology which we could use in our daily routine(and if it is also accurate)? When I was looking for answers I found those techniques/technologies: - Fingerprint senzor - Corneometer - Nova DPM - Pulse oksimetre - Bioelectrical impedance analysis (BIA) - Moisture checker - Opto-thermal transient emission radiometry (OTTER) Which of this is most accurate and fast? Are there any other appropriate? Thank you for your time and your answers!