Abstract: A measuring apparatus for the quantitative evalution of peripheral venous drainage disorders and arterial blood flow disorder in man. In clinical practice, this invention makes it possible on the one hand to objectively detect the changes in cutaneous circulation under physical strain, while it can also be employed, on the other hand, to detect obstacles to venous flow in the extremities. The measuring apparatus detects peripheral drainage and blood flow disorders in human extremities which makes it possible to detect by measuring technology the evacuation and filling of dermal vessels--veins and arteries--non-invasively, objectively and quantitatively.