John Wyatt of Power-free Education and Technology (PET) in the United Kingdom is developing a system that monitors oxygen saturation levels with the crank of a hand. A low-cost, durable finger probe is attached to a “wind up” monitor. The monitor reads oxygen saturation levels in the blood, and can help measure blood oxygen levels of newborns and mothers undergoing cesarean section in the developing world. This is helpful for monitoring oxygen administration. Wyatt’s project is being funded by the Gates Foundation’s Grand Challenges Explorations competition. The monitor seems to be a new iteration of PET’s pulse oximeter, adapted to be hand-crankable and appropriate for low-resource areas.