dropping point tester of lubricating grease

例句：

1. 1.The drop-point tester was used to measure the oil's viscosity.
   滴点测试仪用于测量油的粘度。
2. 2.The engineer used the drop-point tester to check the quality of the new oil.
   工程师使用滴点测试仪检查新油的质量。
3. 3. The drop-point tester is a crucial tool in the maintenance of precision machinery.
   滴点测试仪是精密机械维护中不可或缺的工具。