[High Accuracy]Professional dial shows real or artificial , LCD monitor and LED indicators. The sensitivity and accuracy have been significantly improved compared to the second generation [Professional Selector] The moissanite tester is an instrument used in conjunction with the Selector II. This high-precision professional jewelry selection is only used to distinguish colorless moissanite [Working Principle]If the stone is a real , the green indicator will appear in Selector II. If the user accidentally touches the metal instead of the stone, it will emit a continuous beep [Compact Size]Designed for fast, accurate and testing. The operation is simple and through non-destructible tests. The jewelry tester is , compact (credit card size) and easy to carry [Wide Application]The tester pen has an extremely compact design, ideal for buying jewelry, , real , bars, etc. The cost of the Selector III is also not a fraction of the cost of , but can help you feel real Condition: Item Type:Jewelry Tools Size: . 16 x 4 x 2.1cm / 6.30 x 1.57 x 0.83in Selector battery: 9 V (not included) Moissanite Tester Size: . 2.2 x 4 x 16cm / 0.87 x 1.57 x 6.30in Moissanite tester battery: 9V (not included) Note for moissanite testers: 1. The probe of this instrument is very sensitive. It should carry the PU bag to be protected when not in use. 2. Low-power batteries should be replaced in real time to accurate detection 3. Take out the battery if it is not used for a long time. 4. For a correct test, it is recommended that you make a calibration adjustment after the annual maintenance. Three situations occur during detection: 1. When the real moissanite is measured, the screen will show a green light. After it lights up (note that the green light is a flash), immediately jump to the following two red lights on the screen, indicating that it is real Moissanite. 2. No matter what is being measured, two red lights will appear on the screen and stay lit. Explain that it's not moissanite . 3. When a real is measured, only a green light will appear on the screen, indicating that it is a real . Colour:As Shown Material:plastic Package Contents: 2 x tester Only the above package content, other products are not included. Note: Light reflection 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.