1.30 ~ 1.81RI Gem Refractometer Ruby Jade Diamond Jewelry Refracto Meter Professional Appraisal Tools with Refracting Oil Light

Good luck with your favorite purchases1.30 ~ 1.81RI Gem Refractometer Ruby Jade Diamond Jewelry Refracto Meter Professional Appraisal Tools with Refracting Oil Light Product description: Gem refractometer is the most important tool for gem determination and also the most powerful tool for identifying gem species. It can be used to measure the refractive index of gems without damage, quickly and accurately, and to determine other optical characteristics of gems. This gem refractometer uses high refractive index lead glass as the test prism; Measuring range: 1.30-1.81, accuracy: ± 0.002, power supply device: external battery, 1 * AA, R6; Professional optical design and built-in narrow wavelength quasi monochrome LED light source make the shadow boundary ultra straight and clear; The black background high contrast ruler makes the interface clearer; It is equipped with 3ml refractive oil (refractive index 1.78), and is packaged with leather cases, which are elegant in appearance. Features Item type: refractometer Refractive index range: 1.30-1.81ri Minimum scale: 0.01ri Error: ± 0.003 Lighting: external Size: 61mm * 130mm * 32mm Product packaging: 1 * Gem refractometer 1 * Flashlight 1 * Instructions