- High Precision: This professional gem tester is designed for gemologists who require quick and accurate identification of single and double refracting gemstones. It has a measurement range of 1.30 to 1.81, providing a comprehensive identification capability. - Easy Identification: To determine whether a gemstone is uni-axial or biaxial, simply apply a few drops of refractive oil onto the prism surface using a thin glass bar. This also helps identify if the gem is photopositive or photonegative. - Versatile Refractometer: The diamond tester efficiently differentiates between single and double refracting gemstones, including diamonds, moissanites, and colored gems. This accelerates the gemstone identification process, ensuring reliable results every time. - User-Friendly Display: Featuring a clear display for easy reading, this jewelry refractometer includes an integrated light source and a clear digital scale, making it suitable for use in diverse environments. - Practical Applications: Ideal for gemologists in both professional settings and at home, this tester can be used in gem identification during appraisals, jewelry making, or quality control in gemstone trading. Its reliable performance enhances workflow efficiency. - Compact and Durable: Designed for portability, the refractometer is made from high-quality materials ensuring longevity and consistent performance across various applications. This gem tester is a must-have tool for anyone serious about gemstone identification, offering precision, ease of use, and reliable results.