Medical apparatus, namely, non-invasive, diagnostic units used to measure vascular function and diseases and states and physiological conditions involving the vasculature namely, sphygmotensionmeters and sphygmomanometers; arterial blood pressure measuring apparatus; remote measuring machines for measuring, namely, heartbeat measuring apparatus; devices for measuring blood sugar for medical purposes; diagnostic apparatus for use in diagnosing suspected heart attacks for medical purposes; clinical diagnostic apparatus for use in diagnosing cancer; medical devices to detect and measure photoplethysmographic signals being physiological data in parts of the body to achieve understanding the spectrum of cellular, biochemical, and molecular alterations of a disease that are measurable in biological media such as human tissues, cells, and fluids; medical device, namely, medical respiratory masks being masks for use by medical personnel and sanitary masks for protection against viral infection