Hydrometer
01
比重计, 液体密度计
a device used for measuring the specific gravity of liquids
例子
Car mechanics use a battery hydrometer to accurately determine acid density levels and whether a new battery is needed.
汽车机械师使用电池比重计来准确确定酸密度水平以及是否需要新电池。
Nursery workers test soil hydrometer readings to formulate proper watering guidelines for different plant species.
苗圃工人测试土壤比重计的读数，为不同的植物物种制定适当的浇水指南。
