Based on the cited NCEES whitelist quote, the relevant evidence is the named calculator family or model. The HP 35s is matched to the HP 35s model using the stored calculator model data. This evidence note does not treat every scientific calculator as allowed; it only explains why this exact printed model name fits the whitelist language currently recorded for the FE exam.
“Only the calculators listed below may be used during the FE exam: Casio fx-115 and fx-991 models, Hewlett Packard HP 33s and HP 35s, Texas Instruments TI-30X and TI-36X models.”