This book serves as a valuable resource for anyone venturing into the realm of low temperature experiments, offering a blend of theoretical understanding, practical guidance, laboratory techniques, and the latest advancements in the field. It provides a comprehensive overview, with concise yet insightful physics principles. The book also delves into the history and major developments in refrigeration and cryogenics. Readers might particularly appreciate the coverage of cutting-edge technologies, practical applications, and advancements in thermometry. Furthermore, it presents a meticulous compilation of materials properties data useful for conducting experiments at low temperatures. Setting itself apart, this book emphasizes a practical and accessible approach. With over 400 figures and more than 100 tables, it endeavors to provide clear explanations of laboratory techniques and technical methodologies, enabling readers to grasp essential concepts swiftly. The primary goal of this book is to equip experimental novices, including senior undergraduates and junior graduates, with the foundational knowledge necessary to embark on research in low temperature experiments. However, seasoned scientists and engineers will also benefit, as it offers insights into the latest research developments and practical tips for realizing homemade experimental setups.