1.This is a portable electronic tester for distinguishing real from other simulated stones. It is designed for quick, , and testing. With non-destructive testing, it is easy and accurate to operate. Being as a pocket tester, it is easy to carry. 2.Accurate and reliable test result, easy to read. 3.Testing for loose stones. 4.Real is indicated by red LED and sound:Sound Alert And Readable: Real is indicated by red LED and sound. Accurate and reliable test result, easy to read. Emits audible sounds to easily differentiate the readings,Portable electronic device for distinguishing real from other simulated stones. If stone is Fake crystal, a simulant such as cubic ( ), will be no, If stone is Fake crystal, a simulant such as cubic ( ), will be no . 5.Quickly Test And Portable Design: With non-destructive testing, it is easy and accurate to operate. With metal alert function, it will continuously emit buzzing sound when accidentally touches metal. It is designed for quick, , and testing. the tester are and compact in size (with a size of credit card), easy and convenient to carry. . the tester are and compact in size (with a size of credit card), easy and convenient to carry. Highly Sensitive Tester: Compare with generation II, its sensitivity and accuracy have been greatly improved. Professional Selector III will indicate genuine or fake,Lcd display & led indicator. Condition: 100% New Item Type: Jewelry Tool Note: selector III can measure the different heat conductivity of individual stones and distinguish it through just one-touch simple operation. However, those stones with similar heat conductivity to the can not be distinguished. Colour:Photo Color Material:ABS Package Contents: 1 x Diamond Selector III(Batteries Not Included) 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.