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Typical wearable hygrometer‐based SLMDs using the open chamber method. a) Schematic of the first prototype relying on two humidity sensors integrated onto textile substrates and its validation study compared with VapoMeter. Reproduced with permission.[ 153 ] Copyright 2010, IEEE. b) A wearable SLMD with a rigid open chamber and its validation study compared with DermaLab. Reproduced with permission.[ 95 ] Copyright 2017, Elsevier.
