We're impressed with the accuracy and high level of fit and finish in this Electronic Digital Caliper. It comes in a protective, form fitted, plastic case. With just the touch of a button you can change the measurements from millimeters to inches. With a capacity of 0-4 inches with .01" resolution, or 0-100mm with .01mm resolution this caliper will provide quick and precise measurements. It allows for internal and external measurements and has a depth gauge. The digital caliper also allows measurements to be locked into place or for the slide tension to be adjusted with the locking screw. With the ease of use, anyone from a watchmaker to a jeweler can use this digital caliper and get accurate and precise measurements every time.