| Measurement range | 5 ~ 2000mg / L, exceeding the dilution test. |
| Repeatability | Max. 3% |
| Optical system | 420nm (low range) and 610nm (medium and high range) |
| Temperature control accuracy | ±1 °C |
| Resolution time | 15 min. |
| Batch volume | 4 water samples (or 16 water samples) |
| Weight | Host 0.5kg digestion instrument: 1kg |
| Indication error | Max. ± 5 % |
| Anti-chlorine interference | Max. 2000mg/L |
| Temperature control system | Can be set at room temperature ~200 °C, COD digestion temperature is 165 °C. |
| Temperature control time | Adjustable from 1 to 999 minutes |
| Optical stability | Instrument absorbance drifts less than 0.002A in 20min |
| Dimensions | COD measuring instrument 80mm × 230mm × 55mm Digestion instrument 105mm × 160mm × 90mm |
| Power supply | Rechargeable lithium battery |