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 |
|---|---|---|
| Fill depth to sample through | 2 to 2.2 metres | ICAR-DMR manual, 2011. Top, middle and bottom of this depth differ |
| Spread that sampling must detect | 3 °C | ICAR-DMR manual, 2011. DMR limit between air, compost and plenum |

