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| Measureing Method | Reduction and O-Phenanthroline Visual Colorimetric Method |
|---|---|
| Range | 0.2, 0.5, 1, 2, 5, 10 mg/L |
| Reaction Time | 2 min. |

| Measureing Method | Reduction and O-Phenanthroline Visual Colorimetric Method |
|---|---|
| Range | 0.2, 0.5, 1, 2, 5, 10 mg/L |
| Reaction Time | 2 min. |