These figures belong to the named source and method. Historical costs are not current quotations. A value without its stage, material basis or measurement location is not a farm instruction.
| What is measured | Value and basis | Source and limitation |
|---|---|---|
| Bed above air | 1-2 °C | ICAR-DMR manual, 2011. One air sensor never tells you the bed |
| Ammonia smell threshold | 10 ppm | ICAR-DMR manual, 2011. Below this the nose detects nothing |

