The Fluke Digital Multimeter Principles Fourth Edition paperback- not spirap bound. Book is a comprehensive resource for those interested in the principles of digital multimeters. Authored by Fluke, a trusted brand in the field, this book provides detailed information on test equipment manuals and books. With its spiral-bound format, this book is easy to reference and makes it convenient to have all the essential principles at your fingertips. It is a valuable asset for professionals in the field of test and measurement equipment.