Machine that monitors the amount of oxygen sticking to the hemoglobin in the blood. A BandAid™-style cuff is wrapped around the baby’s toe, foot, hand, or finger. Light shines through the tissues from one side of the cuff to the other. As the light passes through the finger, the light waves are altered. How much the light waves are altered depends on the amount of oxygen stuck to the hemoglobin. This machine allows the NICU staff to monitor the amount of oxygen in the baby's blood without having to obtain blood for laboratory testing.