21 CFR 870.2780 - Hydraulic, pneumatic, or photoelectric plethysmographs.
(a) Identification. A hydraulic, pneumatic, or photoelectric plethysmograph is a device used to estimate blood flow in a region of the body using hydraulic, pneumatic, or photoelectric measurement techniques.
Title 21 published on 2014-04-01
no entries appear in the Federal Register after this date.