[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><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><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><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.