CFR › Title 21 › Part 882 › §882.183521 CFR §882.1835Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. A physiological signal amplifier is a general purpose device used to electrically amplify signals derived from various physiological sources (e.g., the electroencephalogram).(b)Classification. Class II (performance standards).