Gemstone Refractometer, Digital Jewelry Tester Identification Tools with Large LCD Backlight, Refractive Index 1.300-3.000/error: + -0.005/accuracy: 0.001, for Jewelry, Gold & Silver and Diamond

◉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. Gemstone Refractometer, Jewelry Tester Identification Tools with Large Lcd Backlight, Error: + -0.005/accuracy: 0.001/Refractive Index 1.300-3.000◉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.◉Specifications:Name:Digital Gemstone RefractometerMeasuring range: refractive index 1.300-3.000Measurement error: + -0.005Measurement accuracy: 0.001Battery life:10.000 TimesPower supply: 700mA Lithium BatteryProduct Size: 13.5x7.8x2.4cm(5.31x3.1x0.94inch)Net weight: 0.8kg(1.76lbs)◉What’s Included:Gemstone Refractometer × 1Protective Case × 1

• ◉HIGH QUALITY MATERIALS: The gem refractometer uses hard aluminum alloy to create a work surfaces, which is scratch-resistant and sturdy, providing stable support for precision testing. It is equipped with an ABS engineering plastic power switch and built-in triple insulation protection to effectively block the risk of leakage
• ◉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.
• ◉ EASY AND CLEAN TESTING: Gemstone Refractometer No refractive oil is required, just bring the sample's measuring surfaces close to the measuring platform to measure. Based on this parameter, you can determine whether the gem is a uniaxial crystal or a biaxial crystal
• ◉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.
• ◉WIDE RANGE OF APPLICATIONS: 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.