This module, one of 25 on vocational education training for careers in environmental health occupations, contains self-instructional materials on using detector tubes and pumps. Following guidelines for students and instructors and an introduction that explains what the student will learn are three lessons: (1) naming the component parts of the sampling pump and detector tube; (2) assembling and using a soapbubble meter for calibrating a detector tube sampling pump; and (3) measuring the amount of carbon monoxide in the air around a fossil-fuel-fired heater, using a detector tube. 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. Two performance tests cover calibrating the sampling pump and measuring concentrations of gases or vapors using detector tubes and pumps. (CT)