Portable Gem Refractometer with LCD Display, Measures Refractive Index 1.300-3.000, Accuracy 0.001, 700mAh Battery, for Various Gemstones

**Optimized Text:** This Professional Gemstone Identification refractometer features a precision optical system and an extensive measurement range (RI 1.300–3.000), enabling precise identification of diverse gemstones, including diamonds, sapphires, rubies, emeralds, and others. It is indispensable for gemologists, jewelry designers, and enthusiasts. **Working Principle:** Utilizing total internal reflection, the refractometer measures a gemstone’s refractive index—a critical optical parameter. This allows users to distinguish gem types based on their distinct optical characteristics. **FEATURES:** - **Precision Measurement:** Accuracy of ±0.005, with a minimum scale value of 0.001. - **Large LCD Backlit Screen.** - **Durable Aluminum Alloy Table.** - **Insulation Switch:** Constructed from ABS material. - **Built-in 700mAh Lithium Battery:** Supports up to 10,000 measurements. **SPECIFICATIONS:** Measuring Range: Refractive Index 1.300–3.000 Error: ±0.005 Accuracy: 0.001 Battery Type: Lithium Battery (700mAh) Battery Life: Approximately 10,000 tests Product Dimensions: 13.5×7.8×2.4 cm Net Weight: 0.8 kg **PACKAGE INCLUDES:** 1 × Gemstone Refractometer 2 × Calibration Blocks (1×1.487, 1×1.806) 1 × Aluminum Box 1 × Instruction Manual

• Professional Gemstone Refractometer, Measures Refractive Index 1.300-3.000 with 0.001 Accuracy, Determines Optical Characteristics, Non-Destructive and Fast Testing
• Simple Gem Identification Instrument, No Refractive Oil Needed, Place Sample Close to Platform for Instant Results, Simplifies Work While Preserving Delicate Gem Integrity
• Premium Gem Refractometer with Hard Aluminum Alloy Work Surface, Scratch-Resistant and Sturdy for Precision Testing, ABS Engineering Plastic Power Switch, Built-In Triple Insulation Protection Against Leakage
• Jewelry Tester with Large LCD Screen for Clear Reading, Rechargeable 700mAh Battery for 10000 Tests per Charge, Works in Low Light
• Gemstone Identification Tester for Uniaxial and Biaxial Crystals, Quickly and Accurately Identifies Single and Double Gemstones, Engineered for Solid Materials with Refractive Index Verification