mechanical point indicator

例句：

1. 1. This mechanical pointindicator can detect the presence of a specific chemical in the air.
   这个机械点指示器可以检测空气中特定化学物质的存在。
2. 2.The engineer used this mechanical point indicator to troubleshoot the faulty circuit.
   工程师使用这个机械点指示器来诊断故障电路。
3. 3.The manufacturer claims that their mechanical point indicator is more accurate than others.
   制造商声称他们的机械点指示器比其他人更准确。