The two indicators on the finger-clip oximeter are SPO2, which refers to the oxygen saturation, or the amount of oxygen in the blood, which is normally above 95%, and Pr, which refers to the number of pulses, which is normally 60 to 100 per minute. Finger-clip oximeters can be used in hospitals as well as at home because they are relatively small and simple to operate, and they have two values on them. 1. One of them is displaying SPO2, this value represents the oxygen content in the blood, it is a rough estimation of the value, under normal circumstances, it is to be above 95%, if it is lower than 92% it suggests that the blood is lacking in oxygen, it may be due to respiratory diseases or poor blood circulation. 2. Another indicator is pr, which represents the number of pulse beats monitored. The number of pulse beats can reflect the number of heart beats, which is normally 60~100 beats per minute, but if the patient has atrial fibrillation, the number of heart beats can’t be well reflected, and it can only be used as a reference. If the pulse count is too high or too low it should be taken seriously and further checked for heart problems. When the finger clip oximeter is used, you should see the infrared light on, in addition to keep your fingers dry, the surface of the nails should preferably not have foreign objects.