These hydrometers measure the percentage of sodium chloride (Salinity). Specifically, model 6611-1 measures the saturation percentage of sodium chloride in solutions and model 6611-2 measures the percentage by weight of sodium chloride in solutions. Both models are calibrated for use at 15°C (60°F).
Specifications
| Item No. | Measuring Type | Range | Subdivisions | Length |
| 6611-1 | Saturation Percentage | 0 to 100% | 1.0% | 12 in. (305 mm) |
| 6611-2 | Percentage by Weight | 0 to 26.5% | 0.5% | 12 in. (305 mm) |
