With its simple design and operation, this lightweight polycarbonate caliper makes precise measurement a breeze. Just push a button to toggle between millimeters, inches, and fractions of inches. With 0.001" accuracy and an easy-to-read digital display, it eliminates guesswork altogether. The caliper uses a long-lasting CR2032 3V Lithium battery that is very common and can be easily replaced. Plus, it comes in a protective case with a hanging tab for easy storage.