Zhengxun took a pulse oximeter from an experimental animal and looked in the closet and immediately called for researchers.
The pulse oximeter is a device that allows non-invasive measurements of the saturation of haemoglobin with oxygen (SpO2);
A doctor can check this for you; you can also monitor it yourself using a finger pulse oximeter, available in medical supply stores.
Because maximal total light absorption corresponds to a pulse, the pulse oximeter also provides a figure for pulse rate.
