Tonometer

The tonometer includes wrist/arm belt, pressure increasing unit, pressure decreasing unit, piezoelectric assembly, signal amplifier unit and processing unit. The wrist/arm belt is used in winding the wrist/arm of the blood pressure testee; the pressure increasing unit and the pressure decreasing unit are used to increase and decrease the pressure inside the wrist/arm belt separately; the piezoelectric assembly outputs the piezoelectric pulse signals of the testee; the signal amplifier unit amplifies these piezoelectric pulse signals for output; and the processing unit compares the raising slope and falling slope of these piezoelectric pulse signals to find out the systolic pressure and diastolic pressure.