It is the purpose of this book to provide the Scientist with inexpensive instruments that can be built in the home shop. This could be a high school or college student or a professional. Many of the instruments shown in this book cost thousands of dollars retail but can be built for less than $50.00 in parts. The instruments have been proven and published in several electronics magazines. The majority of instruments are physics oriented but also encompasses chemistry and biology. This book is compiled of both published items and other writings of the author. This book comes with a CD which can be downloaded.