guoyjmm Professional Digital Refractometer for Gemstones, Gem Tester for All Stones, Gem Refractometer, with LCD Display, Refractive Index 1.300-3.000, Measuring Accuracy 0.001

guoyjmm Professional Digital Refractometer for Gemstones, Gem Tester for All Stones, Gem Refractometer, with LCD Display, Refractive Index 1.300-3.000, Measuring Accuracy 0.001

• 【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
• 【Excellent Materials】Crafted with hard aluminum alloy for scratch-proof work platforms,this gem tester provides 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
• 【Test Method】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】: The working principle of the refractometer is based on total internal reflection. The refractive index is a very important optical parameter, and the characteristics of gemstones can be determined based on this parameter
• 【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