There is provided a device (100) for use in determining a hydration level of skin (102). The device (100) comprises a light source (104-1, 104-2) configured to emit light (106-1, 106-2) and a first polarizer (108-1, 108-2) arranged to polarize light (106-1, 106-2) emitted from the light source (104-1, 104-2) in a first polarization direction (110-1, 110-2) to illuminate the skin (102) with polarized light (106-1, 106-2). The device (100) comprises a second polarizer (112) arranged to polarize light (114-1, 114-2) from the skin (102) in a second polarization direction (116). The second polarization direction (116) is orientated at an angle in a range from 30 to 60 degrees with respect to the first polarization direction (110-1, 110-2). The device (100) comprises a light detector (118) configured to detect the polarized light (114-1, 114-2) from the skin (102) for use in determining a hydration level of the skin.
