Gemstone Refractometer with LCD Screen, Jewelry Tester Tool for Gold Silver Diamond, Refractive Index 1.300-3.000

**Optimized Text:** This Professional Gemstone Identification refractometer features a precision optical system and a broad measurement range (RI 1.300–3.000), enabling accurate identification of gemstones like diamonds, sapphires, rubies, emeralds, and others. It is indispensable for gemologists, jewelry designers, and enthusiasts. **Working Principle:** Utilizing total internal reflection, this device measures a gemstone’s refractive index—a critical optical parameter—to help users distinguish between different gem types based on their optical properties. **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: ~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 Test Method, This Gem Identification Instrument Requires No Refractive Oil, Place Sample Close To Platform For Instant Results, Simplifies Work While Preserving Delicate Gem Integrity
• Jewelry Tester with Large LCD Screen for Clear Reading, Rechargeable 700mAh Battery Supports 10000 Measurements per Charge
• Premium Gem Refractometer with Hard Aluminum Alloy Work Surface, Scratch-Resistant and Sturdy, ABS Engineering Plastic Power Switch, Built-In Triple Insulation Protection for Leakage Prevention
• Gemstone Identification Tester for Uniaxial and Biaxial Crystals, Quickly and Accurately Identifies Single and Double Gemstones, Compatible with Solid Materials Requiring Refractive Index Verification