1. Battery: 9V battery (not included) 2. It is easy to carry. 3. It is a convenient testing tool. It indicates the testing situation through LED lights and sounds to distinguish readings. 4. It is non - destructive testing. It won't damage your items. It will automatically give an alarm if the battery power is too low. 5. It is a professional gemstone identifier. This gemstone testing device is not only a diamond tester but also a multi - gemstone tester. It can detect the authenticity of gemstones, including diamonds, sapphires, rubies, crystals, jadeites and other gemstones of various sizes. 6. Color: Silver - grey 7. Material: Plastic 8. Dimensions: 135 x 40 x 22 mm 9. Package contents: - 1 testing pen - 1 drilling base - 1 instruction manual in both Chinese and English - 1 leather case 10. Only the above package contents are included, and other products are not included. 11. Note: Light and different displays may cause a slight difference between the color of the item in the picture and the actual one. The allowable measurement error is ±1 - 3 cm.