Section 888.4150 - Calipers for clinical use(a)Identification. A caliper for clinical use is a compass-like device intended for use in measuring the thickness or diameter of a part of the body or the distance between two body surfaces, such as for measuring an excised skeletal specimen to determine the proper replacement size of a prosthesis.(b)Classification. Class I (general controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter, subject to the limitations in § 888.9 .52 FR 33702, Sept. 4, 1987, as amended at 66 FR 38815 , July 25, 2001