Optical sensor device for hydration measurement

An optical sensor device for determining a hydration level information of an object, comprising:

• a light-emitting element configured to emit a first light at a first wavelength and a second light at a second wavelength;
• a light-receiving element configured to receive a first reflected light at the first wavelength and a second reflected light at the second wavelength from the object;
• and
• an analyzer configured to perform a hydration measurement to determine the hydration level information, wherein performing the hydration measurement comprises:
• obtaining a first reference signal strength at the first wavelength and a second reference signal strength at the second wavelength from the light-receiving element when the object is not present;
• obtaining a first signal strength of the first reflected light and a second signal strength of the second reflected light from the light-receiving element when the object is present;
• and
• determining the hydration level information based on the first reference signal strength, the second reference signal strength, the first signal strength, and the second signal strength.