The dataset contains data from an interlaboratory comparison conducted in EURAMET in 2019-2021, with the final report published in Oct 2023. The report and the ILC protocol are available in a different upload. This dataset consists of 3 files: participant information.xlsx: information on the setups used by each participant, their role in the ILC, temperatures measured at, the probes they measured on, the volume of chambers and the nature of the thermostat (bath, climate chamber or a subchamber). preprocessed data and drift.xlsx: preprocessed probe resistance, reference temperature, link corrected resistance, unilateral degree of equivalence, normalised error, pressure (if available), humidity (if available), pilot measurements in liquid and air for each probe, the list of points excluded from the consensus computations. selfheating.xlsx: probe-by-probe selfheating data from a number of participants (but not all).