It is suitable for matching with compatible blood oxygen measuring equipment for measuring pulse oxygen saturation and pulse rate
The index finger is preferred for measurement, and the middle finger or ring finger can be used; The fingernail of the tested person can not be smeared with nail polish and other cosmetics. The fingernail of the tested person can not be too long.
Too high ambient light can also affect measurements, including fluorescent, Bi ruby, infrared heaters, direct sunlight, etc.
The measurement accuracy will also be affected by the violent activity of the measured part and the strong interference of the electrosurgical equipment.