pulse oximeter, finger digital device to measure person`s oxygen saturation. reduced oxygenation is an emergency sign of pneumoni

blood blue check clinical clip closeup corona coronavirus covid device digital display emergency equipment finger fingertip hand health healthcare heart human light mature measurement medical mint monitoring novel oximeter oximetry oxygen oxygenated oxygenation oxymeter pill pneumonia portable probe pulse pulsoximeter results sarscov saturation senior sensor services sign viral virus