This module, one of 25 on vocational education training for careers in environmental health occupations, contains self-instructional materials on using a stereo microscope. Following guidelines for students and instructors and an introduction that explains what the student will learn are three lessons: (1) accurately naming each part of the stereo microscope, stating the function of each part, and properly handling and cleaning the instrument; (2) using the microscope to examine and study various materials and objects; and (3) using the microscope to clasify insects into groups by body structure. Each lesson contains objectives, recommended methods and locations for practice, performance criteria, equipment and supplies to perform a task, detailed step-by-step instructions for learning a task, and performance exercises. A performance test on using a stereo microscope is included. (CT)