| Test parameters | N, P, K, organic matter, salinity, and pH |
| Nutrient stability | ABS of light drift< 0.003 |
| Nutrient repeatability | Light Abs< 0.005 |
| Linearity errors | Red light: Copper sulphate Blue light: Potassium Bichromate< 3.0% |
| Sensitivity | Red light: ≥ 4.5 ×10-5 Blue light: ≥ 3.17 ×10-3 |
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