line tester

例句：

1. 1. The engineer useda line tester to check the integrityof the electrical wiring.
   工程师使用线测试器检查电气布线的完整性。
2. 2. Theline tester detected a fault in thepower line and shut down the system immediately.
   线测试器检测到电力线路中的故障，并立即关闭了系统。
3. 3. Thetechnician used a line tester to troubleshoot the problem with the communication cables.
   技术人员使用线测试器来诊断通信电缆的问题。