The IMechE Engineers Data Book is free to student and apprentice members of the Institution of Mechanical Engineers, or may be purchased by all other members or non-members by downloading the app, and clicking on the Purchase button. The Data Book provides a concise and useful source of up-to-date essential information for the student or practising engineer. In App format, this handy guide is perfectly designed for use on smartphones, and includes a handy calculator to convert between commonly used engineering values, such as pressure, temperature, flow, torque, weight, area, mass etc.