1. Stable Performance: The jewelry refractometer has a measuring range of 1.30–1.81, a division value/accuracy of 0.01, and features a visible display for easy reading. With its builtin light source and clear digital scale display, you can use the refractometer in various environments. 2. Easy to Use: The refractometer is precise, lightweight, and compact, with simple operation, making it easy to carry and use. It is also one of the few instruments capable of providing information for both opaque and transparent gemstones. 3. Professional Features: The refractometer can quickly and accurately identify single and double refractive gemstones, including diamonds, moissanite, and colored gemstones. It does not require RI liquid, delivers consistent results every time, and features a visible display for easy reading of measurements. 4. Professional Design: This refractometer is designed for measuring the refractive index of gemstones and solid materials. Its simple design style makes it regarded by many as an essential gemstone testing device.