metrolac hydrometer

例句：

1. 1.The metrolac hydrometer was used to measure the acidity of the solution.
   自动电位滴定仪被用来测量溶液的酸性。
2. 2. The metrolac hydrometer was used to determine the concentration of the sample.
   自动电位滴定仪被用来确定样品的浓度。
3. 3. The metrolac hydrometer was used to analyze the chemical composition of the sample.
   自动电位滴定仪被用来分析样品的化学成分。