This innovative GemOro Testerossa tester has the sleekest most ergonomic shape. Intuitive finger grip pads offer increased user-friendliness and ease of use. Even better, it has a built-in LED stone illumination and UV fluorescence detection light. Comes complete with a precision retractable probe-tip with enhanced durability, and best of all, an indestructible polycarbonate housing with molded rubber case for increased impact resistance. Features a fast warm-up time, plus a user programmable, talking (English, German, Italian, Spanish, French, Russian, Chinese, Japanese, Arabic and more) or ringtone sounds, and glowing light bar / probe tip for quick stone identification (Green = Diamond, Blue = Moissanite, Yellow = Sapphire and Red = Metal Alert ). The metal alert warning feature informs you if the setting is touched. The auto-off function preserves battery life. Easily identifies genuine sapphire watch crystals too. Powered and charged (rechargeable batteries) by a Micro USB or included AC Adapter. Look no further than the Testerossa! Designed in USA, Made in China.