Deliverable D1: Report on the calibration of soil-moisture measurement devices using a primary method, based on evolved water vapour detection, and transfer standards, such as "standardised" loss on drying (LoD) or fibre-coupled spectrometers, to ens

This document presents Deliverable D1, "Report on the calibration of soil-moisture measurement devices using a primary method based on evolved water vapour detection, and transfer standards such as standardised loss on drying (LoD) or fibre-coupled spectrometers, to ensure SI-traceable point-scale soil moisture measurements with uncertainties of 5 % under laboratory conditions," of the 21GRD08 SoMMet (Soil Moisture Metrology) project, funded under the European Partnership on Metrology from October 2022 to September 2025. The project 21GRD08 SoMMet has received funding from the European Partnership on Metrology, co-financed from the European Union’s Horizon Europe Research and Innovation Programme and by the Participating States. • Funder name: European Partnership on Metrology• Funder ID: 10.13039/100019599• Grant number: 21GRD08 SoMMet