It includes a set of Franz-type vertical diffusion chambers and a thermostat coupled to an automatic acceptor fluid intake. Company: Hanson Microette TM Topical & Transdermal Diffusion Cell System, Hanson Research. Corporation, USA. The system is used in studies to evaluate: the barrier properties of human skin, the ability of substances to penetrate the skin, as well as to understand the kinetics of diffusion of this process. Biological samples (ex-vivo skin) as well as synthetic membranes (artificial skin) can be used.