precision frequency meter

例句：

1. 1.The precision frequency meter was used to measure the temperature of the liquid.
   精密频率计被用来测量液体的温度。
2. 2. The engineer used the precision frequency meter to check the accuracy of the machine.
   工程师使用精密频率计来检查机器的准确性。
3. 3. The precision frequency meter was used to detect the presence of a foreign object in the circuit.
   精密频率计被用来检测电路中是否存在外来物体。