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,...