[Code of Federal Regulations] [Title 21, Volume 8] [Revised as of April 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR890.1225] [Page 489] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 890--PHYSICAL MEDICINE DEVICES--Table of Contents Subpart B--Physical Medicine Diagnostic Devices Sec. 890.1225 Chronaximeter. (a) Identification. A chronaximeter is a device intended for medical purposes to measure neuromuscular excitability by means of a strength- duration curve that provides a basis for diagnosis and prognosis of neurological dysfunction. (b) Classification. Class II (performance standards).