| 73 / | HD | MEASURING AND TESTING |
| 23.2 | DF | GAS ANALYSIS {15} |
| 29.01 | DF | .~ Moisture content or vapor pressure {4} |
| 29.02 | DF | .~.~ Hygrometer {4} |
| 335.06 | DF | .~.~.~ Wet and dry responsive elements {2} |
| 335.08 | ![]() | .~.~.~.~ Wet bulb detail {1} |
| 335.09 | DF | .~.~.~.~.~> Relative air motion creating means (e.g., sling psychrometer) |