drop-testing machine

例句：

1. 1. This drop-testing machine is used to test the accuracy of the pH scale.
   这台滴定机用于测试pH刻度的准确度。
2. 2. The engineer used a drop-testing machine to measure the concentration of the sample.
   工程师使用滴定机测量样本的浓度。
3. 3. The drop-testing machine was used to check the consistency of the paint.
   滴定机被用来检查油漆的一致性。