Section 880.2200 - Liquid crystal forehead temperature strip(a)Identification. A liquid crystal forehead temperature strip is a device applied to the forehead that is used to indicate the presence or absence of fever, or to monitor body temperature changes. The device displays the color changes of heat sensitive liquid crystals corresponding to the variation in the surface temperature of the skin. The liquid crystals, which are cholesteric esters, are sealed in plastic.(b)Classification. Class II (special controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to § 880.9 .45 FR 69682, Oct. 21, 1980, as amended at 63 FR 59228, Nov. 3, 1998