Two-channel Universal-Photo- Plethysmograph for recording of arterial pulse curves - especially from fingers and toes - and the changes of blood-filling in the skin and for measuring the periphere systolic pressure. Arterial Applications: Simultaneous record of pulse curves from fingers, toes and A. temporalis and other superficial vessels - Provocation maneuver for diagnosis of Morbus Raynaud - Measurement of pulse velocity and comparison of pulse delay - Record of systolic blood pressure on fingers, toes and penis. Venous Applications: Test of the venous muscle pump for evaluation of venous valves and the hemodynamic effect of varices.