Battery: 9V battery(not included)<br> Convenient for carrying.<br> Convenient Tester Tool - LED light and audio indicate testing result, easily differentiate the readings<br> Non-destructive testing - Do not hurt your item. will automatically alarm if the battery is too low.<br> Professional 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 fake, including: diamond, sapphire, ruby, crystal, agate, jadeite, and other precious stone of various sizes.<br> Colour: silver-gray<br> Material: plastic<br> Size: 135 x 40 x 22mm<br> Package Contents:<br> 1 x Tester Pen<br> 1 x drill floor<br> 1 x Chinese and English manual<br> 1 x leather case<br> Only the above package content, other products are not included.<br> Note: Light shooting 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.