The Hach color test reads the apparent color created by dissolved substances that can indicate industrial, agricultural, or natural pollution.
| Case Style | D |
| Method Name | Color disc/ APHA Platinum – Cobalt Standard |
| Model | CO-1 |
| Model | CO-1 |
| Number of tests | No Limit |
| Parameter | Color |
| Parameter | Color – as color units |
| Platform | Color Disc |
| Range | 0 – 100 units |
| Range 2 | 0 – 500 units |
| Smallest Increment | 5 units 25 |
| Standard Range | 0 – 100 units; 0 – 500 units |
| What’s included? | Includes color disc, comparator box and tubes, instructions and carrying case. |

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