CFR › Title 21 › Part 882 › §882.190021 CFR §882.1900Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. An evoked response auditory stimulator is a device that produces a sound stimulus for use in evoked response measurements or electroencephalogram activation.(b)Classification. Class II (performance standards).