Home equipment is designed for use in the home environment, low-intensity use of equipment; and medical equipment designed for use in a professional medical environment, compared with home equipment with corrosion resistance, high durability, and adapt to the use of high-intensity, can be 7x24 hours of continuous use, home equipment in the same environment and the intensity of the use of inaccurate measurements, because components can not achieve such a high intensity of continuous use requirements will be prone to failure or even damage. Because the components can not meet the requirements of such high intensity of continuous use, it will be prone to failure, or even damage.