The size in the circle serves for a guidebook in measuring the quantity of pressure utilized through the user. Alternatively, the brightness of the circle determines the amount of blood going out and in from the user's fingertip. This information will then be transformed into systolic and diastolic blood pressure https://power-bank-mi55543.gynoblog.com/21928302/the-basic-principles-of-digital-blood-pressure-monitor-walgreens