voltage meter

例句：

1. 1. The engineer needs to check the voltage of the circuit before starting the machine.
   工程师需要在启动机器之前检查电路的电压。
2. 2.The new voltmeter is more accurate than the old one.
   这款新型电压表比旧款更精确。
3. 3. The technician used a voltmeter to measure the current flowing through the wires.
   技术人员使用电压表测量通过电线的电流。