colorimetric tube

例句：

1. 1.The colorimetric tube is used to measure the concentration of a solution.
   比色管用于测量溶液的浓度。
2. 2. The colorimetric tube was used to determine the pH of the solution.
   比色管被用来测定溶液的pH值。
3. 3. The colorimetric tube was used to measure the concentration of a solution.
   比色管被用来测量溶液的浓度。