DK91006-200 Gem Refractometer - Accurate RI Measurement - Jewelry Gemology Tool. Introducing the DK91006-900 Gem Refractometer, a cutting-edge instrument that sets new standards in gemstone analysis. Designed to deliver precise and reliable measurements, this refractometer is a must-have tool for gemologists and jewelry enthusiasts alike. With a measuring range of 1.35 to 1.82 Refractive Index (RI), the DK91006-900 ensures accurate readings for a wide variety of gemstones. Its remarkable minimum gradation of 0.01 RI allows for highly detailed and fine-tuned analyses, empowering you to identify and distinguish gemstones with unparalleled precision. Equipped with internal LED illumination, the refractometer eliminates the need for a separate cell box, streamlining the measurement process and ensuring optimal clarity in readings. The polarizing filter further enhances the accuracy of results, reducing potential interference and providing you with reliable data for confident decision-making. Crafted with efficiency in mind, the DK91006-900 boasts a compact size of 137mm x 40mm x 85mm, making it easily portable and convenient for both laboratory and field use. Despite its advanced capabilities, the refractometer remains lightweight at just 750g, allowing for effortless handling and reducing user fatigue during prolonged use. Powered by two LR6 batteries (AA), this refractometer offers long-lasting and reliable battery life, ensuring uninterrupted performance when you need it most. No need to worry about frequent replacements or power interruptions, as the DK91006-900 is engineered to provide consistent and dependable operation. Whether you are a seasoned gemologist or an enthusiastic jewelry collector, the DK91006-900 Gem Refractometer is your indispensable companion in the world of gemstone analysis. Experience the pinnacle of accuracy, efficiency, and ease-of-use with this exceptional tool. Unlock the secrets of gemstones with confidence and precision and elevate your gemstone identification capabilities with the DK91006-900 Gem Refractometer. Specifications: Measuring Range: 1.35-1.82 RI Minimum gradation: 0.01 RI Illumination: internal LED illumination without cell box Size:137mm x 40mm x 85mm Filter: polarizing filter Weight:750g Power Supply: 2 pcs LR6 battery (AA) How to Use a Refractometer Effectively Step 1: Set Up the Instrument Place the refractometer on a stable worktable and open the upper cover. Using a thin glass bar, carefully apply a few drops of the specialized refractive oil onto the prism's surface. Step 2: Prepare the Gem Position the gem to be measured so that its ground surface is in close contact with the prism. Gently press it down to ensure even distribution of the refractive oil between the two surfaces. Close the upper cover securely. Step 3: Optimize Viewing Conditions Align the entrance filter of the refractometer with the light source to create uniform illumination. Adjust the brightness of the viewing field to ensure consistent luminance. Step 4: Achieve Sharp Focus Fine-tune the focus until the scale becomes as sharp as possible, enabling accurate measurements. Step 5: Place the Gemstone Gently slide the gemstone from the metal surround onto the prism. Make sure the chosen facet is facing down and rests on the prism's surface. Step 6: Rotate and Observe Peering through the eyepiece, gradually rotate the gemstone through a full 360-degree rotation while maintaining constant contact between the chosen facet and the prism. Step 7: Record Measurements a. Single Shadow Edge: If only one shadow edge is observed, note the exact position of the shadow edge. Record this reading with decimal precision. b. Double Shadow Edges: If two shadow edges are visible, record the highest reading with three decimal places. Then, rotate the gemstone and record the lowest reading. By following these refined steps, you will ensure accurate and reliable measurements using the refractometer. Remember to handle both the instrument and the gemstone with care throughout the process.
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