The purpose of this part of IEC60216 , which is a Technical Report, is to validate the procedures of IECTS60216‑7‑1 in providing a similar temperature index to conventional methods used in other parts of the IEC60216 series. These round robin test results do not provide statistical analysis for precisions. The round robin test focuses on preliminary studies to understand the evaluation and calculation procedures, influence on apparatus, and data variance among laboratories before determination of precisions.