YXHXWKJ Gemstone Refractometer, Jewelry Tester Identification Tools, with LCD Screens, Refractive Index 1.300-3.000, for, Gold ＆ Silver, Diamond,Jade, Crystal

Accurately Identify Gemstones in Seconds: Portable Digital Refractometer for Jewelers, Hobbyists & Collectors (No Oil Needed!)Unlock Professional Gem Identification Anywhere! Refractive Index is one of the most critical properties for distinguishing gem species and verifying authenticity. This portable device brings lab-level precision to your fingertips, using the principle of total internal reflection.No Oil & Effortless : Skip the messy refractive oils! Simply place your gem or solid sample onto the measurement platform for a fast, clean, and contactless reading.Lab-Grade Accuracy : Features a high-precision sensor delivering measurements from 1.300 to 3.000 with an impressive accuracy of ±0.001 and error margin of only ±0.005.Durable, Portable & User-Friendly: Crafted from lightweight yet rugged high-strength aluminum alloy (only 250g / 0.55 lbs), it withstands scratches, corrosion, and fieldwork. The bright backlit LCD display ensures clear readings anywhere.Long-Lasting & Efficient: Powered by a 700mAh battery providing approximately 200 measurements per charge – perfect for gem shows, field trips, or extended shop use.Complete Package for Success: Everything you need is included: Refractometer, Aluminum Box, Tweezers, Countertop cover, Calibration Blocks (1.487 & 1.806), and English Manual.Technical Specifications:Dimensions: 135.0 x 78.0 x 24.0 mm (5.31" x 3.07" x 0.94")Weight: 250g (0.55 lbs)Measurement Range: Refractive Index 1.300 ~ 3.000Accuracy: ±0.001Measurement Error: ±0.005Battery Capacity: 700mAh Lithium BatteryApprox. Measurements per Charge: ~200Important Notes:For optimal accuracy, always calibrate the device using the included calibration blocks (1.487 & 1.806) before each use session.

• 【Jewelry Tester Identification Tool】: The data gemstone refractometer is composed of high-sensitivity sensors and LCD screens.It can measure the refractive index value of gemstones non-destructively, quickly and accurately, and can determine other optical characteristics of gemstones. Measuring range: refractive index 1.300-3.000.a measurement accuracy of up to 0.001, a measurement error of ±0.005.
• 【Working Principle】: The working principle of the refractometer is based on total internal reflection. The refractive index is a very important optical parameter, and the characteristics of gemstones can be determined based on this parameter.The most important tool for gemstone measurement is also the most powerful tool for identifying gem types.
• 【Test Method】: No refractive oil is required, just bring the sample's measuring surfaces close to the measuring platform to measure. Based on this parameter, you can determine whether the gem is a uniaxial crystal or a biaxial crystal. it Is positive phototropism or negative phototropism. In addition, it is equipped with two calibration blocks of 1.487 and 1.806, which are calibrated before measurement to ensure that the measurement results are accurate.
• 【High Quality Materials】: The gem refractometer uses hard aluminum alloy to create a work surfaces, which is scratch-resistant and sturdy, providing stable support for precision testing. It is equipped with an ABS engineering plastic power switch and built-in triple insulation protection to effectively block the risk of leakage.
• 【Wide Applications】: Gemstone ldentification Tester Quickly and accurately identify single and double gemstones, moissanite/diamonds/colored gemstones/crystals, designed for measuring the refractive index of gemstones and solid materials. widely used in gem jewelry stores, etc.