Attach it to your keys , car , bag , or suitcase , and alwayshave a measuring tool at hand With its compact and portable design , this keychain caliper is perfect for measuring For professionals in the fielddof engineering , jewelry making , and more , this caliper provides accurate measurements up to 4cm Made from zinc alloy , this caliper is built to last and can withstanddailyuse Whether you ' re working in a workshop , at home , or on the field , this handy caliper willhelp you measure with ease, Manufacturer: Watreketal