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| Model | Range | Min.Div. | Accuracy | Remark |
| GT211 | Salinity: 0-100‰ Specific gravity: 1.000-1.070sg | Salinity: 1‰ Specific gravity: 0.001sg | Salinity: ±1‰ Specific gravity: ±0.001sg | With ATC |
| GT212 | Salinity: 0-28% | Salinity: 0.2% | Salinity: ±0.2% | With ATC |