Ключевые слова: blood, cardiac, cardiology, care, closeup, corona virus, coronavirus, covid19, device, diagnosis, digital, display, electronic, equipment, finger, fingertip, hand, health, healthcare, heart, heartbeat, hemoglobin, human heart, level, machine, measure, measurement, medical, medical equipment, medicine, modern, monitor, monitoring, oximeter, oxygen, patient, person, pill, pneumonia, portable, pulse, pulse oximeter, rate, saturation, sensor, technology, tool,