Digital Refractometer for All Gemstones, Lab-Grade Precision Gem Tester Tool for Measuring Refractive Index with 0.001 Minimum Scale, Error: ±0.005, Large LCD Backlight

This Professional Gemstone Identification refractometer is equipped with a precision optical system and a wide measurement range (RI 1.300–3.000), allowing accurate identification of various gemstones such as diamonds, sapphires, rubies, emeralds, and more. It is an essential tool for gemologists, jewelry designers, and enthusiasts. Key Features & Advantages: Precision Measurement: Accuracy up to ±0.005, minimum scale value of 0.001, providing reliable data support for gem identification. Large LCD Backlit Screen: Clear display even in low-light environments, easy to read data and reduce eye fatigue. Durable Aluminum Alloy Table: Hardened material, ensuring long-term stability. Insulation Switch: Made of ABS material. Long Battery Life: Built-in 700mAh lithium battery, supports up to 10,000 measurements, suitable for field gemology applications. Technical Specifications： Measuring Range: Refractive Index 1.300–3.000 Error: ±0.005 Accuracy: 0.001 Battery Type: Lithium Battery (700mAh) Battery Life: Approx. 10,000 tests Product Dimensions: 13.5×7.8×2.4 cm Net Weight: 0.8 kg What’s Included: Gemstone Refractometer × 1 Protective Case × 1 User Manual × 1

• PROFESSIONAL GEMSTONE IDENTIFICATION TOOL -- Equipped with precision optical system and LED backlight technology, this refractometer provides accurate refractive index measurements ranging from 1.300 to 3.000, with an exceptional accuracy of ±0.005 and resolution of 0.001. suitable for jewelry professionals and gemology enthusiasts to quickly identify diamonds, sapphires, emeralds, and other gemstones.
• WORKING PRINCIPLE -- Operating on the basis of total internal reflection, the gemstone tester measures one of the most fundamental optical parameters of gemstones—the refractive index. This key characteristic allows users to accurately identify and differentiate gem types based on their unique optical properties.
• EASY AND CLEAN TESTING -- Unlike traditional methods, this gem Identification Instrument requires no refractive oil. Simply place the sample’s measurement close to the platform for instant results. The process not only simplifies working but also maintains the integrity of delicate gems.
• CLEAR VISUAL READING & EXTENDED BATTERY LIFE -- Featuring a large LCD screen with backlight illumination, a high-sensitivity sensor, and intelligent electronics, the device ensures excellent readability even in low-light conditions. Powered by a rechargeable 700mAh lithium battery, it supports up to 10,000 measurements per charge, making it suitable for lab use, field gemology trips, and jewelry store applications.
• WIDE COMPATIBILITY FOR VARIOUS GEMSTONES -- Suitable for both uniaxial and biaxial crystals, this jewelry calibration test tools quickly and accurately identifies single and double gemstones—including moissanite, diamond, colored gems, natural or synthetic stones, minerals, and other solid materials. A must-have for gemologists and serious collectors.