Soil hydrometers: Used to analyse the soil by the departments of farming, forest, water conservancy, architecture, etc.

土壤计：供农林、水利、建筑等部门对土壤分析之用。

youdao

Soil hydrometers: Used to analyse the soil by the departments of farming, forest, water conservancy, architecture, etc.

土壤计：供农林、水利、建筑等部门对土壤分析之用。

youdao