Digital Gemstone Refractometer - Professional Jewelry Tester with 1.300-3.000 RI Range, ±0.005 Error & 0.001 Accuracy for Jade, Crystal, Gem Identification

Specifications:Measuring 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)Products include:1*Gemstone refractometer2*calibration block (1*1.487, 1*1.806)1*aluminum box1*instruction manual

• 1. Durable & Safe Professional Construction：Crafted with a scratch-resistant hard aluminum alloy work surface for stable, precise testing. Features an ABS engineering plastic power switch and built-in triple-layer insulation protection to ensure operational safety and effectively prevent leakage risks.
• 2. High-Precision Digital Measurement：Equipped with high-sensitivity sensors and a clear LCD screen, this digital refractometer measures gemstone refractive index (RI range: 1.300–3.000) non-destructively, quickly, and accurately. Delivers measurement accuracy up to ±0.001 with an error margin of only ±0.005.
• 3. Oil-Free, Contact-Based Testing Method：Requires no refractive index oil—simply place the sample’s measuring surface in contact with the platform for immediate reading. Enables determination of key optical properties, including whether a gem is a uniaxial or biaxial crystal.
• 4. Scientific Principle: Total Internal Reflection：Operates on the principle of total internal reflection to measure refractive index—a critical optical parameter for definitive gemstone identification and analysis of material characteristics.
• 5. Versatile for Gemology & Material Science：Ideal for quickly and accurately identifying single and double refractive gemstones, including moissanite, diamond, colored gems, crystals, and jade. Designed for professionals and enthusiasts measuring refractive index in gemstones and various solid materials.