density logger

例句：

1. 1. The density logger was used to measure the density of the water.
   密度记录器被用来测量水的密度。
2. 2. The scientist used a density logger to study the properties of the material.
   科学家使用密度记录器来研究材料的性质。
3. 3. The density logger recorded the data and sent it back to the laboratory for analysis.
   密度记录器记录了数据，并将其发送回实验室进行分析。