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| Measuring principle | Dichromate colorimetric method |
| COD range | 0.0 to 1500 mg/L |
| Basic accuracy |
≤ 150 mg/L: ± 8% reading ± 1 mg/L ≥ 150 mg/L: ± 8% reading |
| Repeatability | 3% reading |
| Stability | ± 2% (reading )/15min |