Fangrui Product Details Battery: 9v Battery(not Included) Convenient For Carrying. Convenient Tester Tool - Led Light And Audio Indicate Testing Result, Easily Differentiate The Readings Non-destructive Testing - Do Not Hurt Your Item. Automatically Alarm If The Battery Is Too Low. 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, , Jadeite, And Other Precious Stone Of Sizes. Colour: Silver-gray Material: Plastic Size: 135 X 40 X 22mm Package Contents: 1 X Tester Pen 1 X Drill Floor 1 X Chinese And English Manual 1 X Leather Case Only 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.