21 C.F.R. § 880.2920 Clinical mercury thermometer.
Title 21 - Food and Drugs
(a) Identification. A clinical mercury thermometer is a device used to measure oral, rectal, or axillary (armpit) body temperature using the thermal expansion of mercury. (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 69682–69737, Oct. 21, 1980, as amended at 63 FR 59228, Nov. 3, 1998]
Title 21: Food and Drugs
PART 880—GENERAL HOSPITAL AND PERSONAL USE DEVICES
Subpart C—General Hospital and Personal Use Monitoring Devices
§ 880.2920 Clinical mercury thermometer.

