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In this three-part series, testing instrumentation for medical equipment is described, organized, and reviewed. Part I, which appeared in the July-September, 1977 issue, discussed reasons for testing and factors that control the use and need for testing devices. Part I included a review of devices for testing electrical and gas outlets. Other units described included grounding devices, isolated power systems, and conductive flooring testers. Part II continues the series with descriptions of: leakage current, voltage, and resistance testers; insulation testers; multiparameter “safety testers”; patient electrode/lead testers; ECG simulators; and, respiration and blood pressure simulators. Part III will continue the series with a review and description of testing instrumentation for therapeutic equipment including defibrillators and electrosurgical equipment. The series concludes with a discussion of the growing role of testing in the clinical engineering profession.