different gravimetric methods used to determine the TEWL however, these are practically in disuse given lack of reproducibility and discomfort of execution. At the moment, such determinations are made using computerized evaporimeters, some of which are very simple and provide fast readings. Experimental determinations of the skin surface are made by applying a probe to the skin, with a cylindrical Teflon capsule open to the atmosphere. Two hygrosensors send measurements to a central unit, thus recording the amount of water vapour at two levels. These are then integrated and transformed into water transport values by applying Fick’s law.