dial tester

• 拨号盘试验机

dial tester的用法和样例：

例句

1. The phone number is on the dial.
   号码就在拨号盘上。
2. The human experiment was unable to turn the dial and hear a different band, so the same frequency was broadcast.
   人类实验不能转动拨号盘而听到一个不同的波段，因此频率同广播那样。