pulse echo tester

例句：

1. 1. The pulse echo tester wasused to measure the heart rate of thepatient.
   脉冲回声测试器被用来测量病人的心率。
2. 2. The engineer used a pulse echotester to diagnose the problem with thecircuit.
   工程师使用脉冲回声测试器来诊断电路的问题。
3. 3. The pulse echo tester helpedthe doctor to identify the location of thetumor in the patient's chest.
   脉冲回声测试器帮助医生在患者的胸部识别肿瘤的位置。