This module, one of 25 on vocational education training for careers in environmental health occupations, contains self-instructional materials on calibrating a respirable dust sampling device. Following guidelines for students and instructors and an introduction that explains what the student will learn, are three lessons: (1) naming each part of the respirable dust sampling equipment and taking the equipment apart, cleaning it, and reassembling it; (2) assembling and preparing the calibration train, including a soapbubble meter, cyclone respirable dust sampling equipment and calibration container, and personal air sampling pump; and (3) calibrating a respirable dust sampling train using a soapbubble meter. 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 assembling and preparing equipment for calibration, and calibrating a sampling train. (CT)