Portable Gem Refractometer, Jewelry Authenticity Tester, Refractive Index 1.300-3.000, with LCD Display and 700mAh Battery, Measuring Accuracy 0.001, Applicable to Various Gemstones

●This is considered an essential tool for gemstone testing, providing reliable refractive index measurements●Features-The large LCD screen with backlight design provides comfortable viewing and bright and clear effects.- Made of hard aluminum alloy material, it is difficult scratch.-Insulated material to prevent power leakage and unnecessary.●Specifications:Measuring Range: Refractive index 1.300-3.000Measurement Error: ±0.005Measurement Accuracy: 0.001Lithium Power Supply Life: 10.000 TimesPower Supply: 700mA Lithium Power SupplyProduct Size: 13.5x7.8x2.4cm(5.31x3.1x0.94inch)Weight: 250g (0.55 lbs)●Products Include:- Gemstone Refractometer x 1- Box x 1●Notes:-For optimal accuracy, always calibrate the device using the included calibration blocks (1.487 & 1.806) before each use session.-Please allow the slight color difference caused by the shooting light and 1-3cm error due to manual measurement.●Please contact us if you don't understand or have any questions about this product. We are committed to customer satisfaction.

• 【HIGH ACCURACY JEWELRY TESTER】 Gem refractometer can non-destructively, quickly and accurately measure the refractive index value of the gem and determine other optical characteristics of the gem.Various gems can be measured based on the value of the refractive index, because different gems have fixed refractive index.
• 【WORKING PRINCIPLE】Professional Digital Jewelry Refractometer 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
• 【HIGH QUALITY MATERIALS】The Jewelry Tester Identification Tool 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.
• 【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, it can be judged whether a gem is a uniaxial crystal or a biaxial crystal, and whether it has positive or negative phototaxis.
• 【COMPREHENSIVE MATERIAL COMPATIBILITY】Accelerates identification for single/double refractive gems, diamonds, and colored stones. Engineered for solid materials requiring refractive index verification