The cryostat can be used as a calibration device into which instrument probes can be inserted for direct measurements of LNG inside the cryostat. These measurements can then be used to calibrate or validate the instrument. Composition measurements made on the re-vapourised samples are compared with the reference gas values to determine any differences. These differences in composition are quantified and the results are compared to the requirements of the vapourisation testing standard EN 12838:2000. A transportable version of the cryostat is under development providing calibrations and validation in situ at customers’ sites.