调谐指示器

例句：

1. 1. The tuning indicator on the radio is showing a frequency error.
   收音机上的调谐指示器显示频率错误。
2. 2. The engineer used the tuner to adjust the music volume.
   工程师使用调谐器调整音乐音量。
3. 3. The tuning indicator showed that the antenna was not aligned properly.
   调谐指示器显示天线没有正确对准。