{"schema_version":"1.0","generated_at":"2026-10-14T19:15:46+08:00","policy":["Preserve the value and unit printed in the source document.","Use SI as the primary normalized representation and provide US customary units only as a labelled convenience.","Do not convert certifications, IP ratings, protocols or standards as if they were measurements.","For procurement or design, verify tolerances and the current model document."],"quantities":[{"quantity":"temperature","primary":"°C","secondary":"°F","formula":"°F = °C × 9/5 + 32"},{"quantity":"length","primary":"mm","secondary":"in","factor":"1 in = 25.4 mm"},{"quantity":"mass","primary":"kg","secondary":"lb","factor":"1 kg = 2.2046226218 lb"},{"quantity":"sound_pressure","primary":"dB(A)","note":"Do not perform arithmetic conversion; preserve distance and test method."},{"quantity":"voltage","primary":"V","note":"State AC/DC, tolerance and frequency."},{"quantity":"frequency","primary":"Hz / MHz / GHz","note":"Radio bands and permissions are market dependent."},{"quantity":"ingress_protection","primary":"IP code","note":"Classification, not a convertible unit; verify test evidence."}]}