Specification Brand : ERICAT BulletPoint1 : 【Gem Refractometer】Diamond tester can quickly and accurately identifies single and double gemstones. Helps identify diamonds, colored gemstones, speeds up identification of gemstones in packages, even and reliable results every time. BulletPoint2 : 【Stable Performance】The jewelry refractometer has a clearly visible display for easy reading. With the integrated light source and clear digital scale display, you can use the refractometer in different environments. BulletPoint3 : 【How to Measure】Drops of refractive oil onto the surface of prism by a thin glass bar to judge whether a gem is uni-axial or biaxial photopositive or photonegative. BulletPoint4 : 【Quick Results】The Diamond Tester Is Designed To Provide Fast And Accurate Results. You Will Be Able To Know If Something Is Fake In Seconds. It Is Compact And Easy To Use When You Need It. BulletPoint5 : 【Lightweight and Portable】Designed to be lightweight and compact, our Gemstone Refractometer offers unparalleled convenience and portability. It easily fits into your pocket or tool bag, allowing you to assess gemstones on-the-go without any hassle. Color : 0-55 Refractometer ExternallyAssignedProductIdentifier : 8463278198534 ItemName : Professional Gemstones Refractometer, Gem Refractometer Kit with Polarizer Lenses, 1.30~1.81RI Measurement Range and 0.01RI Index Value, 3S Fast Detection and Easy Reading, for Gem Testing Center ItemPackageDimensions_Height : 1 centimeters ItemPackageDimensions_Length : 3 centimeters ItemPackageDimensions_Width : 2 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : science-lab-refractometers Manufacturer : ERICAT ModelName : MBHALBY ModelNumber : MBHALBY NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : TY0219004312 ProductDescription : Gem refractometer is the most important tool for measurement and the most powerful tool for identifying gem species. It can measure the refractive index value of a gem without loss, quickly and accurately, and can determine other optical characteristics of the gem.