Clear Display: The jewelry refractometer has a clearly visible display for easy reading Specially Designed: This refractometer is specially designed to measure the refractive index of and materials. Strong Practicality: The primary use of the portable refractometer is to measure the angle at which light is bent or refracted through the stone. High Accuracy: Professional refractometer has high accuracy, small size, easy portability. Quick Identification: The refractometer can quickly and accurately identify a variety of single and double , helping to identify moissanite, etc.