a device, usually attached to the end of a person's finger, used to measure the level of oxygen in their blood

The nurse monitors the pulse oximeter and gets a reading of 85%. 护士查看了脉搏血氧计，得到一个85%的读数。

A pulse oximeter was put on his finger to check oxygen saturation into body tissue and pulse. 他的手指上放了一个脉搏血氧计，检测身体组织内的氧饱和程度和脉搏。