The present relates to a sample holder comprising a single block (1) made of a thermally conductive material comprising at least two volumes, a reference volume (5) and a sample holding volume (4) directly machined in said single block (1), a heating means (3) and a temperature detector (2), wherein the heating means (3) is preferably embedded in the single block (1) such that the distance between the sample holding volume (4) and the heating means (3) is the same in a heat conductivity sense as the distance between the reference volume (5) and the heating means (3) and the distance between the thermocouple (2) and the heating means (3).