Electronic version of the Analog Stone/Pearl Gauge. Fantastic price for an excellent gauge! This easy-to-use, 3 button gauge is highly accurate, measuring in both millimeters (down to an amazing 2 decimal places) and inches (down to an amazing 3 decimal places). Range is 0-21 mm (0-0.83"). Allows you to "zero" at any position. Features 3 different measuring methods and accommodates both inside and outside dimensions. Made of stainless steel with an impact-resistant, non-glare, gray plastic faces. Comes with a 37 page booklet of tables. Replacement battery and case included.