The Vintage Radio Shack 6" Digital Caliper is a precision tool used in metalworking inspection and measurement. With a measurement range of 0 to 6 inches, both metric and SAE units are displayed on the electronic screen. Originating from China, this digital caliper ensures accurate readings and reliability for a variety of industrial applications. Designed by Radio Shack, this caliper is ideal for professionals seeking precise measurements in their work. I purchased this Caliper at an estate sale and put a new battery in it and works perfect.  It does have a small Crack in the glass, but does not hinder how it works.