1Specially designed for measuring the refractive index of gemstones and solid materials. 2Lightweight and compact, easy to carry. 3This refractometer features high accuracy and easy operation. 4Identify single and double gems quickly and precisely. 5Low battery consumption for long service time. Features: 1. Specially designed for measuring the refractive index of gemstones and solid materials. 2. Lightweight and compact, easy to carry. 3. This refractometer features high accuracy and easy operation. 4. Identify single and double gems quickly and precisely. 5. Low battery consumption for long service time. 6. Approved by strict quality and safety standards for a long and trouble-free using. Specification: Condition: 100% Brand New Item Type: Refractometer Material: ABS Refractive Index Range: 1.30-1.81 RI Color: As Pictures Shown Power Supply: 1 * AA Battery Size: Approx. 13 * 6 * 3.5cm/5.1 * 2.4 * 1.4inch Weight: Approx. 720g Package List: 1 * Refractometer 1 * Electric Torch (Battery is NOT included) 1 * English Manual Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.