Ключевые слова: background, blood, cardiac, cardiology, care, check, clinic, closeup, coronavirus, covid, covid19, device, digital, display, doctor, electronic, electronics, emergency, equipment, finger, fingertip, hand, health, heart, heartbeat, hospital, instrument, level, measure, measurement, medical, medicine, modern, monitor, monitoring, oximeter, oximetry, oxygen, patient, portable, pressure, pulse, pulse oximeter, pulse oximetry, rate, saturation, sensor, technology, test, tool,