Diamond TesterHigh Accuracy Jewelry Diamond Tester / Jewelry Gem Tester Pen / Portable Electronic Diamond Checker ToolProfessional Diamond Selector for Novice and Expert (Battery not Included) Specially designed for true and false gemstone testing, not only fast and accurate, but also safe. Used to distinguish real diamonds from other imitation stones, without adverse effects on gemstones, suitable for: masonry, crystal, agate, red Sapphire, Emerald and more, it is a great tool to test your jewelry. The intuitive display design of the LCD display and LED indicator light makes the operation of the diamond checker tool easy. The probe and the object to be tested must be at a 90-degree angle, and the authenticity of the gemstone can be quickly identified according to the sound and reading (such as cubic zirconium (CZ)) Such imitations will not react when detected). Our high accuracy diamond tester measures about 6.3 x 1.57 x 0.87 inches, it is small and portable, it is light in weight, it can be put into any handbag or backpack, and it will not put too much burden on you when using it. Test Result Analysis:If lights is 4 or 5, it is glass.If lights is 6 or 7, it is true jade.If lights is 7 or 8, it is true crystal.If lights = 9 and have sounds, it is true diamond. Features:- Easy operation. - LED light and audio result indication. - The red light will be showed and the audio indicator will ring if the stone is real diamond. - Simple calibration for stones of various sizes. - Accurate and reliable reading. - Matched with a testing platform for loose stones. - Light weight, matched with a convenient carrying case. - Detailed user manual is included in the package. Maintenance and repair:1. the instrument is very sensitive to the probe, must be particularly careful to protect, do not use should be set on the sheath.2. the preparation of the indicator light is very dark, shows the battery will run out, should be timely replacement battery.3. the instrument is not used for a long time, please take out the battery.4. in order to detect accurately, the proposed correction once a year. Specifications:Color: BlackMaterial: ABSPower supply: 1 * DC 9V Battery (not included)Item size: 14*4*2cm (6.6 * 1.6 * 0.8in) Package Included:1 * Diamond Selector II1 * Testing Platform1 * Carrying Case1 * User Manual