WGFXYBFY Portable Jewelry Refractometer - Gemstone Tester for All Stones, Refractive Index 1.30-1.81 / Accuracy: 0.01, Lab Refractometers

WGFXYBFY Portable Jewelry Refractometer - Gemstone Tester for All Stones, Refractive Index 1.30-1.81 / Accuracy: 0.01, Lab Refractometers

• ★ Working Principle: The Working Principle Of The Gemstone Tester Is To Measure The Refractive Index Of The Gemstone, The Refractive Index Is A Very Important Optical Parameter, According To This Parameter Can Determine The Characteristics Of The Gem.
• ★ Core Advantages: Jewelry Refractometer Has This Refractometer Features High Accuracy, Based On The Refractive Index, It Can Be Determined Whether A Gemstone Is A Uniaxial Crystal Or A Biaxial Crystal, And Whether It Is Positively Phototropic Or Negatively Phototropic. Lab Refractometers Anti-Scratch Anti-Corrosion, Long Service Life.
• ★ Precise Measurement: Digital Gemstone Refractometer For All Stones Measuring Range Is Refractive Index 1.30-1.80, Measurement Accuracy Is 0.01, Is Your Best Helper.
• ★ Small Size and Light Weight: Digital Gem & Glass Refractometer Is Small Size And Light Weight, With Flashlight(The Flashlight Is Powered By 1 Aa Battery, Battery Not Included)Long Service Life. Jewelry Calibration Test Tool For All Kinds Of Gemstones, Jewelry, Etc.
• ★ What You Get: Complete Refractometer Package Including Gemstone Refractometer*1, Flashlight*1, Refraction Oil*1, English Manual*1. Simple Operation And Easy To Use.