sphygmotonograph

例句：

1. 1. The doctor used a manometer to measure the patient's blood pressure.
   医生使用血压计测量患者的血压。
2. 2. The plethysmograph was used to monitor the patient's heart rate during the test.
   脉搏描记器被用来监测患者在测试期间的心率。
3. 3. The manometer reading showed that the patient's blood pressure was within normal ranges.
   血压计读数显示，患者的血压在正常范围内。