Rechargeable Diamond Tester Pen with UV Light Professional Electronic Jewelry Gem Selector compatible with Novice and Expert xt919

[Intuitive & Safe Operation]Featuring an LCD display and LED indicator, our diamond tester delivers precise, easy-to-read results quickly and safely-without damaging genuine diamonds. Ideal compatible with professionals, collectors, and jewelry business owners.<br> [Easy One-Button Testing]Simply turn on the pen, gently touch the gemstone tip, and wait compatible with the audible alert. Real diamonds trigger a reading above 9 with both light and sound signals; no reaction indicates a fake stone like cubic zirconia.<br> [Adjustable Setting compatible with Stone Size]Easily adapt to different gem sizes using the carat adjustment button: activate 1 light compatible with diamonds over 1.0 carats, 2 lights compatible with 0.5 carats, and 3-4 lights compatible with small or finely-cut stones.<br> [Reliable Thermal Conductivity Detection]The tester uses advanced thermal conductivity sensing to distinguish diamonds from imitations. Note: metals may trigger high-frequency sound due to similar conductivity-always follow correct testing procedures and avoid use on metal, skin, or liquids.<br> [Convenient & User-Friendly]Designed compatible with efcompatible withtless use with clear visual and audio cues. compatible with best accuracy, always touch the rear panel during testing and ensure proper tip contact-flashing or shutdown may indicate incorrect operation.<br> Features:<br> Specification:<br> Model:KD-MD2<br> Working voltage:3.3-4.2V<br> Working temperature:10-40℃<br> Product size:158*45*21mm<br> Adapter (not included in this instrument)<br> Adapter voltage:120-240V<br> Data cable plug:type-c<br> Adapter power:1A/2A<br> Adapter output voltage:5V<br> Internal lithium battery parameters<br> Model:14500<br> Voltage:3.7V<br> Capacity:500mAh<br> Color: Black<br> Material: plastic<br> Package Contents:<br> 1 x Diamond Tester Pen<br> 1x Charging line 1metre<br> 1 x Testing Platcompatible withm<br> 1 x User Manual<br> Only the above package content, other products are not included.<br> 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.