Sci-tech Optical Transducers Trainer Model ETR 029 plays a very important role in today’s industrial and domestic applications. Optical transducer trainer model OTT1 is specially designed to cover the study of 4 different types of optical transducers. Experiments covering fundamental characteristics of transducers and study of transducer controlled switching / alarm systems can be performed. The manual consists of various chapters covering Introduction, Theory Types & selection of transducers, their applications and Glossary of terms.