| 73 / | HD | MEASURING AND TESTING |
|
| 53.01 | DF | LIQUID ANALYSIS OR ANALYSIS OF THE SUSPENSION OF SOLIDS IN A LIQUID {15} |
| 61.41 | DF | .~ Content or effect of a constituent of a liquid mixture {8} |
| 61.63 | DF | .~.~ Settling or filtering ability {2} |
| 61.65 |  | .~.~.~ Sedimentation rate {4} |
| 61.66 | DF | .~.~.~.~> With means for accelerating solids (e.g., particles) |
| 61.67 | DF | .~.~.~.~> By pressure measurement |
| 61.68 | DF | .~.~.~.~> Including detail of fluid handling means, sampling, sample handling, or sample preparation |
| 61.69 | DF | .~.~.~.~> By optical measurement |