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. Specification 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:Brand New Item Type: Refractometer Material: ABS Refractive Index Range: 1.30-1.81 RI Color: As Pictures Shown Size: Approx. 13 * 6 * 3.5cm/5.1 * 2.4 * 1.4inch Weight: Approx. 721g Package List: 1 * Refractometer 1 * Electric Torch (Powered by 1 * AA battery which is NOT included)) 1 * English Manual 1 * 3 ML Reflective Index Fluid 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! 1. Reading standard: The eyepiece needs to be adjusted to the clearest number and the shading line scale. 2. The contact surface of the measuring item must be flat, and the diameter is more than 2mm. Package List 1 * Refractometer 1 * Electric Torch (Powered by 1 * AA battery which is NOT included)) 1 * English Manual 1 * 3 ML Reflective Index Fluid