two-scale frequency meter

例句：

1. 1. The two-scale frequency meteris used to measure the frequency of vibrations.
   双刻度频率计用于测量振动的频率。
2. 2. The engineer used the two-scale frequency meter to test the stabilityof the machine.
   工程师使用双刻度频率计测试机器的稳定性。
3. 3. Thetwo-scale frequencymeter was used to detect thepresence of a fault in the circuit.
   双刻度频率计被用来检测电路中是否存在故障。