Battery: 9V battery(not included)Convenient for carrying.Convenient Tester - LED light and audio indicate testing result, easily differentiate the readingsNon-destructive testing - Do not hurt your item. will automatically alarm if the battery is too low. Gemstone Selector - This gemstone testing equipment is not only a diamond tester, but also a multi gemstone tester. can detect if a gemstone is real or , including: diamond, sapphire, ruby, crystal, agate, jadeite, and other precious stone of various sizes.Colour: silver-grayMaterial: plasticSize: 135 x 40 x 22mmPackage Contents:1 x Tester Pen1 x drill floor1 x Chinese and English manual1 x leather caseOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.