[MEASURE REFRACTIVE INDEX] Specially designed for accurately measuring the refractive index of gemstones and solid materials.<br> [PORTABLE AND ] Easy to carry around, perfect for on-the-go identification.<br> [HIGH ACCURACY OPERATION] Features high accuracy and simple operation for precise gem identification.<br> [QUICK GEM IDENTIFICATION] Identify single and double gems quickly and precisely.<br> [LONG BATTERY LIFE] Low battery consumption for extended service time.<br> high accuracy and easy operation.<br> Identify single and double gems quickly and precisely.<br> Low battery consumption for long service time.<br> Approved by quality and safety standards for a long and trouble-free using<br> Colour:Black<br> Material:plastic<br> Package Contents:<br> 1 x Refractometer<br> 1 x Electric Torch (Powered by 1 x AA battery which is NOT included)<br> 1 x 3 ML Reflective Index Fluid<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.