Automated Radiosonde Launchers (ARLs) are increasingly adopted for upper-air observations as they offer major operational advantages compared to manual launches, but they introduce new challenges for maintaining reference-quality humidity measurements within the GCOS Reference Upper-Air Network (GRUAN). In particular, the applicability of the pre-launch Standard Humidity Chamber (SHC) test, routinely used for manual radiosonde launches, has not been systematically assessed for radiosondes stored inside ARLs prior to launch.