This book deals with the automatic and precision machines which depend for their operation on sophisticated instruments capable of giving accurate measurements. Aspects on Calibration, Accreditation, traceability, globalization of trade etc. have been covered thoroughly along with the latest trends on metrological aspects, particularly the role of computers and microprocessors have been added. Numerical and problems play an important role in clarifying the text and accordingly, a large number of solved problems have been added. This book also covers in-depth topics on Quality Control & Assurance; Total Quality Management and ISO SeriesThis book are being presented in line with the latest practices and trends in the industry, also the syllabus of all the engineering colleges have been kept in view while writing this revised edition.