reentrant-type frequency meter

例句：

1. 1. The reentrant-type frequency meter is used to measure the frequency of signals in a circuit.
   回程型频率表用于测量电路中信号的频率。
2. 2. The reciprocal-type frequency meter is more accurate than its counterpart.
   回程型频率表比其对应产品更准确。
3. 3.The reentrant-type frequency meter is widely used in industrial applications.
   回程型频率表在工业应用中被广泛使用。