A system and method for taking non-invasive blood pressure and other vascular parameter measurements includes placing a vascular compression device about an appendage of a subject. By way of detecting and judging whether the stethoscope head arrives on correct stethoscopic position by the sensor, unwanted sounds generating by frictions, translations, or collisions during the stethoscopic process can be effectively eliminated such that the stethoscopic quality can be improved. The precursor may itself comprise polymers, e. The solution is concentrated to create a product. The air outlet is connected to a pump 32 so that there is a pressure difference between the air inlet and the air outlet. Each end cap also has a hole extending through it that provides a coupling point for the chair backrest.