fA key symptom of respiratory illnesses is diminished lung function, which may lead to lower blood oxygen levels. If monitoring your blood oxygen levels matters to you, the Braun Pulse oximeter 1 makes it comfortable, clear and convenient. Take readings effortlessly and accurately with the simple finger clip design. See results at a glance with the back-lit, rotating OLED display. And keep it close, always, with the handy lanyard attachment.