triode ion gauge

例句：

1. 1. The triode ion gauge was used to measurethe concentration of pollutants in thewater.
   三极离子计被用来测量水中污染物的浓度。
2. 2. The triodeion gauge was used to monitor the pHlevels of the soil.
   三极离子计被用来监测土壤的pH水平。
3. 3. Thetriode ion gauge was used todetect the presence of heavy metals inthe water.
   三极离子计被用来检测水中重金属的存在。