differential conductivity recorder

例句：

1. 1. The differential conductivity recorder was used to measure the electrical properties of the sample.
   差分电导率记录仪被用来测量样品的电学特性。
2. 2. The differential conductivity recorder was used to detect the presence of impurities in the sample.
   差分电导率记录仪被用来检测样品中的杂质。
3. 3. The differential conductivity recorder was used to monitor the changes in the sample's electrical properties over time.
   差分电导率记录仪被用来监测样品在时间上的电学属性变化。