2 doctors weighed in:

Is there a small portable device that can measure hydration levels to see if someone is drinking not enough or too much water?

2 doctors weighed in
Dr. Lee Peter Bee
Internal Medicine
1 doctor agrees

In brief: Unfortunately no

Unfortunately to get an adequate intake and output for hydration status, the best way is to measure accurately what you're taking in, what you are output.
Other methods for such a hydration status is obtaining orthostatic tilt test, measuring blood pressure, heart rate between supine, seated, and standing positions, assessing for skin turgor, moisture in the mucous membrane.

In brief: Unfortunately no

Unfortunately to get an adequate intake and output for hydration status, the best way is to measure accurately what you're taking in, what you are output.
Other methods for such a hydration status is obtaining orthostatic tilt test, measuring blood pressure, heart rate between supine, seated, and standing positions, assessing for skin turgor, moisture in the mucous membrane.
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