Gem Refractometer with LCD Display, Measures All Gemstones, Refractive Index 1.300-3.000, 0.001 Accuracy, 700mAh Battery, Ideal for Jewelry and Jade Stores

Accurately Identify Gemstones in Seconds: Portable Digital Refractometer for Jewelers, Hobbyists & Collectors (No Oil Required!) Professional Gem Identification On the Go! Refractive index is a key property for distinguishing gem species and confirming authenticity. This portable device delivers lab-grade precision using total internal reflection technology. No Oil, No Mess: Skip the hassle of refractive oils. Simply place your gem or solid sample on the measurement platform for a quick, clean, and contactless reading. Lab-Level Precision: Equipped with a high-precision sensor, it measures refractive indices from 1.300 to 3.000 with an accuracy of ±0.001 and a margin of error of just ±0.005. Durable & Portable: Made from lightweight yet sturdy high-strength aluminum alloy (only 250g / 0.55 lbs), it resists scratches, corrosion, and rough handling. The bright backlit LCD ensures clear readings in any environment. Long Battery Life: A 700mAh battery supports around 200 measurements per charge—ideal for gem shows, fieldwork, or extended shop sessions. Everything Included: The package contains the refractometer, aluminum case, tweezers, cleaning cloth, countertop cover, calibration blocks (1.487 & 1.806), and an English manual. Technical Specifications: Dimensions: 135.0 x 78.0 x 24.0 mm (5.31" x 3.07" x 0.94") Weight: 250g (0.55 lbs) Measurement Range: 1.300 ~ 3.000 Accuracy: ±0.001 Measurement Error: ±0.005 Battery: 700mAh Lithium Measurements per Charge: ~200 Note: For best results, calibrate the device with the included blocks (1.487 & 1.806) before each use.

• Gem Refractometer with High Precision Sensor Measures Refractive Index for Gemstone Identification Based on Total Internal Reflection Principle
• Portable Jewelry Refractometer With LCD Backlit Display, High-Strength Aluminum Alloy Shell For Scratch And Corrosion Resistance, Weighs Only 250 Grams, Built-In Triple Insulation Protection For Safe Use
• Precise Gemstone Refractometer with High Accuracy, Measures Refractive Index from 1.300 to 3.000, Non-Destructive Testing Tool for Jewelry Identification, Error as Low as ±0.005
• Easy to use gem refractometer, no refractive oil needed, just place the sample close to the measuring platform. Determine if the gemstone is uniaxial or biaxial, includes 1.487 and 1.806 calibration blocks for accurate results.
• Gemstone Refractometer For Measuring Refractive Index Of Single Crystal, Twin Crystal, Diamonds And Colored Gemstones, Widely Used In Jewelry Appraisal, Gem Processing And Collecting, Note: Not For Semi-Finished, Poorly Polished Gemstones Below 2.0mm² Or Rough Stones