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Best Choice Jiawu 
Digital BRIX Refractometer 0-55% Brix Range, Handheld Pocket High Accuracy BRIX Meter, Digital BRIX Tester Sugar Content 【HIGH ACCURACY】Brix meter has built in excellent chip, high measurement accuracy, sensitive response, fast measurement sNandaga 
Alcohol Refractometer for Spirit Alcohol Volume Percent Measurement 0~80% v/v. Alcohol Volume Meter for Alcohol Liquor P 【Concentration Measurement Range】Turn the eyepiece to adjust the handwheel to make the blue and white lines clear. The sQUMOX 
QUMOX Refractometer for Brix Testing, 0-32% Scale with ATC, Ideal for Early-Stage sap Monitoring, Fruit Juice, Wine, and Single Scale Design: Measures Brix from 0–32%, ideal for low-sugar liquids such as fruit juice, wine, and sap.FUTISKY 
Brix Refractometer with ATC,Digital Handheld Refractometer for Beer Wine Brewing, Dual Scale-Specific Gravity 1.000-1.13 Main body is made of aluminum and ABS rubber, sturdy design, anti-rust and resistant to abrasion and corrosion. OpticalBest Value Fdit 
Professional Brix Refractometer 0-32%, Sugar & Alcohol Tester for Beer, Wine, Juice, with ATC (10-30°C), Includes Case, Professional Measuring Instrument: Perfectly designed for accurately testing the Brix level of sugar in various liquids,20% Off Jaerb 
Salinity Refractometer, 0-100% Handheld Salinometer with Temperature Compensation Salinity Meter Hydrometer, Digital Ref 【ATC FUNCTION】Salinity refractometer with automatic temperature compensation with high- seawater salinity refractometer,15% Off Zudoo 
Brix Refractometer, Portable Digital Handheld Brix Refractometer, 0 to 55% Range High Accuracy Brix Meter, Automatic Cal ★【FAST AND ACCURATE READINGS】: Digital Brix refractometer has built in excellent chip, high measurement accuracy, sensitGAIN EXPRESS Dual Scale Salinity Refractometer ATC 0-100ppt (0-10%) & 1.000-1.070 Specific Gravity, Portable Meter Tester for Seawate ✅Accurate Salinity Measurements: This optical refractometer accurately measures the salinity of seawater or low concentrHHTEC HHTEC Refractometer 0-90% Brix - Measure Sugar Content for Honey, Syrup, Juice & Drinks - Precise Hand Refractometer wit Easy to use: ideal for measuring honey, syrup, juices, jams, drinks and other liquids.QUMOX QUMOX 3-in-1 Honey Refractometer for Moisture, Brix and Baume, 58–90% Brix Scale – No Battery Needed, ATC Optical Tester 3-in-1 Measurement – Quickly measures honey moisture content (12–27%), sugar concentration (Brix 58–90%), and Baume (38–Generic Refractometer for Sugar Content, 0-90% Range, ATC Function, Maple Syrup and Honey Testing， Bee Tools Honey Refractometer 【Precise Sugar Content Testing】This refractometer delivers highly accurate sugar content measurements, ranging from 0-90GUPE Brix Refractometer, Dual Scale Specific and Brix Digital Handheld Refractometer 0%~32% Honey Moisture Tester, Hydrometer Accurate Work: Built in automatic temperature compensation enables consistent and accurate readings, just work at room t15% Off Yosoo Bee Tools Honey Refractometer 58-90% Sugar Content Beekeeping Portable Refractometer Honey Concentration Meter for Honey Precision Measurement: Sharp dividing line (blue-white), good readability (daylight recognizable), adjustable eyepiece fQUMOX QUMOX 0–28% Salinity Refractometer with ATC, Optical Salt Meter for Sodium Chloride (NaCl) – Sea Water, Brine, Pickle, F Accurate Salt Measurement – Measures salinity from 0% to 28% with ±0.2% precision, ideal for testing salt levels in seawGAIN EXPRESS 0-10% Brix Refractometer with ATC Low-Concentrated Sugar Content Solutions Accuracy 0.1% Maple Sap Cutting Liquid CNC Ma Measuring Range: 0~10 %Brix with 0.1% division and ±0.1%Brix accuracyGAIN EXPRESS 0-28% Salinity Refractometer ATC, Sodium Chloride (NaCl) Salt Level Meter Tester, Test Kit for Sea Water Brine Seawater Accurately Measure Salt Concentration: Easily determine the salinity of water containing dissolved salt and minimal otheAgriculture Solutions Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT with Automatic Temperature Compensation, b Measure salt water or salinity of water, ideal for aquariums and marine monitoring.QUMOX QUMOX 3-in-1 Veterinary Refractometer for Urine Specific Gravity & Serum Protein – Dog, Cat, Pet Health Monitor, Optical 3-in-1 Veterinary Testing – Designed for animals, this refractometer tests urine specific gravity for dogs and cats, and15% Off Fdit Alcohol Refractometer, Professional Handheld Alcohol 0-80% Test Refractometer Wine Tester Meter Measure Instrument 【Alcohol Content Measurement Tool Tester】Alcohol Refractometer designed for testing Spirit Alcohol Volume Percent, for BXUMIUZIY XUMIUZIY Digital Brix Refractometer, High Brix Tester for Determining Sugar Content, 0-55% Meter with Automatic Calibrat [Accurate Readings] Get accurate Brix measurements with the built-in high- chip for accurate results.EverTech Dual Scale 0-32% Brix and 1.000-1.130 SG Handheld Refractometer ATC Beer with Carry Case YS136 Durable Aluminum Body – Made from high-quality aluminum with non-slip ABS rubber grip. Sturdy, rust-resistant, abrasion-GAIN EXPRESS Clinical Refractometer with ATC, Tri Scale Serum Protein/Urine Specific Gravity/Refractive Index, for Veterinary Dog Cat Human clinical refractometer 3-in-1 testing of Serum protein, Urine specific gravity, and Refractive indexAIMALL AIMALL Portable ATC Refractometer 0-32% Brix Tester for Sugar Fruit Alcohol Meter – Handheld Meter with Calibration Scre Precise Brix Measurements for Food and Industry The Portable Refractometer measures the Brix level from 0% to 32%, proviGAIN EXPRESS 3-in-1 Automotive Battery Antifreeze Refractometer, -60~0°C Ethylene/ -50~0°C Propylene Glycol/ 1.100-1.400 Battery Flui 3 Scales in 1 : (1)Battery Fluids Specific Gravity (Density): 1.100 - 1.400kg/l ; (2) Ethylene Glycol Freezing Point: -6QUMOX QUMOX 0–80% Brix Refractometer for Sugar Content in Fruit, Juice, Honey, Syrup & Drinks – Optical Tester with ATC, No Ba Wide 0–80% Brix Range – Measures sugar content in fruits, fruit juice, honey, maple syrup, soft drinks, and other sugaryLICAEVEY Digital Brix Refractometer, 0‑55% Range High Accuracy Brix Tester Meter for Fruit Juice and Coffee Beverage Drinks Sugar HIGH ACCURACY: Brix meter has built in excellent chip, high measurement accuracy, sensitive response, fast measurement sSunGrow SunGrow Aquarium Refractometer, 7.6 Inches, Measure Salinity of Water, Remarkable Accuracy, Includes Calibration Tool, E Specifically Designed Refractometer For Saltwater Aquarium --- The algorithm is made specifically for testing seawater aQUMOX QUMOX 4-in-1 Coolant Refractometer for Antifreeze, Battery Acid, Diesel Exhaust Fluid & Windshield Washer – No Battery N 4-in-1 Fluid Testing – Accurately tests the freezing point of coolant, specific gravity of battery acid, urea concentratAnton Paar SmartRef by Anton Paar - Digital Refractometer - Sugar, Brix, Salinity, Plato, Specific Gravity (SG) Wide measuring range (0 to 85 °Brix)RZ Mask RZ Salinity Refractometer Dual Scale Salinity Meter, ATC Professional Salinity Water Test Kit for Aquariums, Marine Moni Measures on 2 Scales: Aquariums refractometer features Specific Gravity (D 20/20) 1.000-1.070sg and parts per thousand 0gernie Digital Brix Refractometer, 0‑55% Range High Accuracy Automatic Calibration Brix Tester HD Backlight Display Portable Ha WIDE APPLICATION: Digital brix refractometer is widely used in food, beverage, fruit sugar content determination, crop sMEKOTRIN MEKOTRIN Digital Brix Refractometer, Brix Tester 3 Datas Display Temperature Compensation Function 0‑55% for Sugar Conte EASY TO USE: Sugar degree meter refractometer is equipped with a high transmittance refractive prism, and the liquid canGugxiom Gem Refractometer, Jewelry Refractometer, RHG181 1.30-1.81 Professional Ldentification Gem Refractometer, Gem Portable R ABS MATERIAL: This gem tester is made of ABS material. This material is hard and wear-resistant, which can meet the operMUNEFE Gem Refractometer, Professional Gemstone Ldentification, Gem Ldentification Tester with Reflective Index Fluid for Jewel EXCELLENT PERFORMANCE: This refractometer is designed to measure the refractive index of gemstones and solid materials,NDNCZDHC Antifreeze Refractometer, Glycol Refractometer Car Antifreeze Battery Acid Engine Coolant Tester Tool RHA-503ATC High quality material can make sure the durability and stability of the refractometerJoyzan Joyzan Antifreeze Refractometer, Frost Protection Refractometer ATC for Glycol Coolant Battery Acid Tester Checking The Car Owners’Helper: This antifreeze tester helps measure the specific gravity of battery acid and then provides a quick rTUXIAOT 0-90% Brix Refractometer with ATC, Handheld Sugar Content Tester for Honey, Syrup, Molasses, Fruit Juice & Beverages, Po Wide Range ApplicationsMTSDM MTSDM Digital Handheld Refractometer, Portable Alcohol Refractometer, Brix Refractometers, Hand-held Alcohol Content Mea 【Professional Measurement Instrument】: The sugar tester refractometer is a highly professional tool for accurately measuTOPINCN TOPINCN BRIX Refractometer Dual Skala Messer for Sugar Brewing, Reliable Specific Difficult -Strength Evaluation, for Dr [Exact work] Enjoy precise results with automatic temperature compensationGAIN EXPRESS 5-in-1 Automotive Battery Antifreeze Refractometer ATC for Specific Gravity, Ethylene Propylene Glycol System & Windshie Portable design & easy to use, with 5 clearly defined scales for the following 3 main uses:YUEHISY Digital Brix Refractometer for Fruit Juice and Coffee, Rechargeable Sugar Tester Mete with Auto Temperature Compensation WIDE APPLICATION: Digital brix refractometer is widely used in food, beverage, fruit sugar content determination, crop sGAIN EXPRESS Handheld Heavy Duty Calcite Dichroscope, Trichoic Gem & Gemstones Gemological Testing, Jeweler Tool Metal Body Gemology 💍Determine dichroism: The dichroscope helps determine if a stone is dichroic, meaning it reflects two different colors.BTER Gem Refractometer, Professional High Accuracy Jewelry Gem Refractometer Quick Identification 1.30 to 1.81 Measuring Rang 【JEWELRY GEMSTONE IDENTIFICATION TOOL】The primary use of this gem refractometer is to measure the angle at which light iMOTRAIN Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium, Saltwater Tester Hydrometer, Dual Sacle 0-100ppt & Dual-Scale Measurement for Accuracy: This refractometer measures both salt percentage and specific gravity, with a speciContinuum Aquatics Continuum Reagents Refractometer and Hydrometer Calibration Standard – Seawater Reference for Calibration of Density Mea Designed to provide an accurate reference for the calibration of seawater refractometers, hydrometers and other densityXRCLIF Juice Refractometer Hydrometer with ATC, Brix Reader Meter Refractometer, Brix 0-32% Measuring Sugar Content in Fruit, S 🍓【Easy to Use】— Place 2 - 3 drops of liquid sample onto the prism of this brix refractometer, then look through the eyeFUTISKY Precision Salinity Refractometer for Seawater Aquariums, 0-100 PPT with Automatic Temperature Compensation, Aluminum All Constructed from an aluminium body and ABS rubber, the salinity refractometer is lightweight and extremely durable and cPOENVFPO Brix Refractometer Meter Dual Scale Handheld Measuring Tool for Sugar Brewing, Simple to Use with Clear Reading, for Agr [EFFORTLESS ] Simply place a few drops of liquid on the prism, face it towards light, and view through the eyepiece.DANOPLUS DANOPLUS Honey Moisture 58~90% Brix Refractometer with ATC, Handheld High Measuring Range Sugar Content, Honey, Jelly, J This refractometer is designed for testing the honey nutrient content of honey moisture, glucose brix and glucose baume.Greystone Books Refractometers Made Easy: The "RIGHT-WAY" Guide to Using Gem Identification Tools Refractometers Made Easy: The Right-Way Guide To Using Gem Identification ToolsRGBS Refractometer for Dogs and Cats for Pets Urine Specific Weight (1000~1060) Clinical Refractometer with Serum or Plasma P Clinical Refractometer - This refractometer can measure urine-specific gravity and serum protein immediately for cats anDenash Digital Brix Refractometer, Temperature Compensation Function Easy to Use 0‑55% 3 Datas Display Brix Meter for Drinks fo HIGH ACCURACY: Brix meter has built in excellent chip, high measurement accuracy, sensitive response, fast measurement sLuqeeg Brix Refractometer 0~80%, Digital Refractometer, Handheld Sugar Refractometer for Measuring Sugar Content in Fruit, Hone TOPINCN TOPINCN Brix Refractometer High Accuracy Brix Tester Meter, Suitable for Fruit Sugar Content Detection, PCB Material [BACKLIGHT DISPLAY] HD display offers clear visibility and supports three data display options.CHUSHEN Refractometer,ST335A LCD Digital Refractometer Portable Handheld Honey Refractometer ATC Sugar Percent Tester Sugar Conc 🥁 Practical Refractometer: it is used to test the concentration and refractive index of sugar-containing solutions in fJectse Refractometer Concentration Meter Brix Tester 0-90% with Automatic Temperature Compensation, Simple Operation, Wide Appl Easy to use, sturdy refractometer is compact in size and light in weight, convenient to keep up and carry around.MUNEFE MUNEFE Sugar Tester Refractometer, Digital Handheld Refractometer, 0~32% Brix Meter Refractometer for Measuring Sugar Co PROFESSIONAL MEASUREMENT INSTRUMENT:The sugar tester refractometer is a highly professional tool for accurately measurinAIMALL AIMALL 3-in-1 58-90% Honey Refractometer Calibration Refractometer Honey Moisture Meter for Honey Moisture & Brix & Baum 🍯 Precision Measurement: Ensure the highest quality of honey with accurate moisture (12-27%), Brix (58-90%), and BaumeOVAQUIXI OVAQUIXI Refractometer with Temperature Compensation, 0-55% Brix Range, Fast Measurement Speed for Food and Beverage Ind [EFFICIENT & ACCURATE] Enjoy fast and precise sugar content measurements with this Brix meter, designed for efficient anDiyeeni Diyeeni Digital Brix Refractometer, Digital Brix Tester with LCD, Automatic Temp Compensation Meter Refractometer, ±0.2% 【Broad Utility】: The digital Brix refractometer is a versatile tool, finding applications across various industries suchHaofy Honey Refractometer Brix Refractometer 58-90% for Honey Test, Fruit, Beer, Wine and Sugar Test NANBEI NANBEI 0-80% Brix Meter Refractometer, Refractometer Honey,Portable Refractometer for Honey,Digital brix Refractometer f Brix Range 0-80%, the reading resolution is 0.5 %.Brix Accuracy: +/-0.5%,large scale range makes it be suitable in widerYUEHISY Digital Refractometer, 0 to 55% High Accuracy Sugar Tester Meter with HD Backlight Display, Automatic Temperature Compen WIDE APPLICATION: Digital sugar degree refractometer is widely used in food, beverage, fruit sugar content determinationEVGATSAUTO EVGATSAUTO Digital Brix Refractometer, Sugar Content Tester High Accuracy with Auto Temperature Compensation for Fruit J 【Durable and Reliable】: This refractometer is equipped with a built-in chip with a resolution of 0.1% Brix and an accuraGAIN EXPRESS Alcohol Refractometer with ATC 0~80% VOL Volume, Optical Handheld Concentration Tester Meter for Distilled Beverages Win MEASURING RANGE : 0-80% v/v (Volume Percentage) DIVISION: 1% (0-60%), 2% (60-80%)Yosoo Wine Refractometer, 3 in 1 Hand Held Sugar Content Mearsuring Tool with Home Brewing Equipment for Beer Wine Fruit Sugar 【3 in 1 Wine Refractometers】3 in one hand held refractometers, with mesure range 0-25% Vol, 0-40% Brix and 0-22 Baume.GAIN EXPRESS Gain Express 6-in-1 Automotive Car Refractometer ATC for Adblue/Antifreeze/Battery Acid/Windshield Fluid, Coolant Charge 6 SCALES : (1) Battery Fluids, (2) Ethylene Glycol Freezing Point, (3) Propylene Glycol Freezing Point, (4) Cleaning FluSorandy Sorandy Professional Gemstone Refractometer with Electric Torch for Easy Identification of Single and Double Gemstones, 【Compact Design】This professional gem refractometer is specifically designed to measure the refractive index of gemstoneGeneric Milwaukee Instruments Seawater (Salinity) Refractometer w/AccuraSea Calibration Solution Bundle (2 Items) This bundle includes TWO items: the The MA887 Milwaukee Instruments Seawater (Salinity) Refractometer, and the Two LittlBewinner Bewinner Honey Refractometer 0-90% Handheld Pocket Sugar Concentration Meter with ±0.2% Brix ±0.3°C Accuracy for Honey Q Elegant color and stylish design, compact size and portable, easy to carry anywhere and anytime.Oshhni Oshhni Jewelry Refractometer Accessories Lightweight Professional with Flashlight Refractive Measuring Portable for Jewe 【Complete Kit】: The Gem Refractometer Kit includes a refractometer, a flashlight, reflective oil, an instruction manual,EVTSCAN EVTSCAN Handheld Refractometer Ethylene Glycol Concentration Meter Water Battery Fluid Content Meter Tester Light weight and small size, wide range of applications, it can be used for all kinds of different liquid samples.TEKCOPLUS 3-in-1 Animal Clinical Refractometer, Veterinary Refractometer, Scale Clinical Refractometer for Cat and Dog Urine Speci VETERINARY REFRACTOMETER: Veterinary Refractometer has Triple scales for testing the health index of urine specific gravXRCLIF Frost Protection Refractometer, 4-in-1 Antifreeze Tester, Coolant Tester, Refractometer for Checking The Freezing Point 🚗【4-in-1】 - If you find that the battery of your cars, solar system or heat pumps is no longer durable, do not hurry toFlagfront Flagfront Digital Brix Refractometer brix Meter Refractometer USB C Charging Automatic Temperature Compensation Brix Ref The Flagfront Charging Digital Brix can Clearly and accurately display the measured sugar content and the automatic tempSOULONG SOULONG Portable Honey Refractometer Mini Honey Brix Tester Measures Sugar Water Baume Content 58-90% 10-33% 38-43oBe wi [PRECISE & RELIABLE MEASUREMENTS] This portable honey refractometer delivers highly accurate readings for sugar contentHHTEC HH Tec Wine Refractometer Salinity Refractometer 0 to 32 Brix (ZUKER) 0 140 Ochsle 0 27 KMW with ATC for Winzer Wine Bee Perfect for winemakers, beer brewers and fermentation - determine the optimal harvest time by precise measurement of thePlyisty RHB-10ATC Digital Handheld Refractometer with ATC, 0-80% Range, 0.1% High Accuracy, for Beer Wine Brewing The refractive index made according to different refractive index of the liquid is very accurateXRCLIF XRCLIF High Precision Alcohol Refractometer 0-80% v/v, Hand-held Alcohol Content Measurement Tool, Portable Refractomete 💎【Wide Application】—the alcohol refractometer widely used in scientific research, food industry production, alcohol purAUNMAS AUNMAS Honey Refractometer Professional Brix Refractometer with ATC Optical Scale 58 to 90 Percent Sugar Range 50F to 86 【Precision Honey Testing】This honey refractometer is built for sugar content measurement in honey with a 58 to 90 percenOVAQUIXI OVAQUIXI Propylene Glycol Refractometer High Accuracy Antifreeze Freezing Point Tester for Car Wiper Fluid Ethylene Glyc [WIDELY MEASURING] Test the freezing point of propylene glycol, ethylene glycol, wiper fluid, automotive , and specificFlagfront Digital Brix Refractometer Flagfront brix Meter Refractometer Automatic Temperature Compensation Brix Refractometer Rang The Flagfront Digital Brix can clearly and accurately display the measured sugar content and the automatic temperature cSpacnana Spacnana Digital Sugar Degree Meter Refractometer with HD Backlight Display, Rechargeable Brix Meter for Liquid Sugar Co WIDE APPLICATION: Digital sugar degree refractometer is widely used in food, beverage, fruit sugar content determinationEacam Eacam Salinity Refractometer Handheld Seawater Hydrometers Optical Salinity Tester Portable ATC Refractometer 0-100‰ & 1 🔷 Handheld design and non-slip rubber handle for easy operation.Built-in automatic temperature compensation(ATC) to getSDEESS Refractometer, Digital Honey Refractometer 4 In 1 Water/Be'/Refractive Index It can also be used in the manufacture of beer and wineXYZGTYUJ 0-22% Digital Coffee Refractometer Pocket Tester Concentration Refractometer Densitometer Measuring Tool for Beekeepers 1. The 0-22% Digital Coffee Refractometer offers a measurement range of 0-22% BrixNotimin Notimin Alcohol Meter Refractometer Alcohol 0-80% Hand Refractometer for Spirits, Distilled Ethanol with Water Such as W The alcohol meter refractometer is used to measure the percentage of alcohol content of brandy, whisky, vodka, etc. Notegernie Brix Meter, 0-50% Portable LCD Digital Brix Refractometer, Automatic Temperature Compensation, Handheld Sugar Refractome Power saving, after 3 minutes without any operation, it will automatically turn off the power.gernie Digital Brix Refractometer, 0-50% Measurement Range, LCD Digital Digital Sugar Brix Refractometer, Hand Held Pocket Refr Elegant color and stylish design, compact size and portable, easy to carry anywhere and anytime.Extech Extech RF12 Portable Brix Refractometer (0 to 18%) with Automatic Temperature Compensation Compact size, easy to operateYaSao Salinity Refractometer Handheld Seawater Hydrometers Optical Salinity Tester Portable ATC Refractometer, Dual Scale: 0-1 Yechiry Yechiry Compact Gemstone Refractometer, Easy to Use for Identifying Single and Double Gems, Ideal for Gemologists and Je [HIGHLY ACCURATE GEMSTONE IDENTIFICATION] Designed for measuring the refractive index of gemstones with precision and eagernie Alcohol Refractometer, Refractometer for Spirit Alcohol Volume Percent Measurement with Automatic Temperature Compensati A professional measure instrument to test alcohol concentration of liquorBROLEO Digital Brix Refractometer, Portable Brix Meter with Automatic Temperature Compensation Brix Refractometer & 0-50% Range The fruit brix tester has a wide measurement range and is suitable for almost any sugar containing substance.Zudoo Digital Brix Refractometer, Range 0‑55% Brix Meter, Automatic Temperature Compensation High Accuracy Digital Refractomet [Precision Measurement] Digital refractometer delivers accurate sugar content readings with 0.1% resolution and ±0.2% acZerodis Zerodis Portable Handheld Refractometer, 3 in 1 Brix Baume Tester with Measurement Range 0-25% Vol 0-40% Brix 0 22 Baume [Measurement] This 3-in-1 refractometer provides accurate measurements for content (0-25% vol), sugar concentration (0-4Asixxsix 0‑80% Digital Refractometer, LCD Display Handheld Digital Brix Refractometer for Fruits, Juices, Food, Vegetables, Beer, Quick and Convenient: One click test, which can simplify the complexity. It only takes 3s to get the results. It is simpSUZLA 32% 55% Digital Brix Refractometer Autorefractometer Sugar Refractometer Hydrometer for Grapes Fruit Drinks Beverages Ti Widely used in food, beverage, fruit sugar content determination, crop sugar content determination and other fields.SUCRFXJ Digital Refractometer Brix Meter, LCD Brix Refractometer Fruit Sugar Meter, Backlit Digital Display Brix Meter Tester, A High Accuracy: Using High-Precision Sensor, High Sensitivity, The Water Temperature Does Not Affect The Reading.The TestBaxnore Baxnore RHG181 Professional Gemstone Refractometer 1.30 1.81 RI High Accuracy Jewelry Testing Tool for Gemologists Jewel [PRECISION GEMSTONE ANALYSIS] Engineered specifically for gemologists and jewelry professionals, this refractometer deli