Measuring salinity, NaCl concentration, or seawater parameters with an optical refractometer requires a steady hand and a shadow-free eyepiece — conditions that are impractical in field work, wastewater processing, or aquaculture environments. The VEE GEE Scientific MDX-Series Digital Salinity Refractometer replaces the eyepiece with a large LCD display and presses temperature compensation into every reading via ATC — delivering accurate results in seconds from a 4–5 drop sample regardless of ambient light or operator experience. IP65/67 rated for water-jet and dust resistance — appropriate for aquaculture tanks, wastewater treatment facilities, and outdoor sampling environments where moisture exposure is unavoidable. Each MDX model measures 4 scales simultaneously on a single sample, displayed together on the screen. Includes hard shell case, disposable pipette, and battery. Features and Benefits 4 Measurement Scales per Model: MDX-201 measures NaCl%, Refractive Index, g/L, and Brix simultaneously on a single sample. MDX-202 measures Salinity (ppt), Chlorinity (‰), Specific Gravity, and Refractive Index. ATC for Field Accuracy: Temperature compensation is automatic — critical for environmental field sampling where ambient temperature varies throughout a measurement session. IP65/67 for Aquatic Environments: Water-jet resistant and dustproof — appropriate for direct use near aquaculture tanks, in wastewater treatment facilities, and in outdoor sampling contexts. LCD Display: All scales and sample temperature display simultaneously — no separate thermometer needed to document measurement conditions. Continuous Loop Average: Multiple successive readings averaged automatically — useful for water samples with suspended particulates where individual drop readings may vary. Full Kit Included: Hard shell protective case, disposable pipette, AAA battery, and user manual — ready for immediate use after distilled water calibration. MDX-Series Specifications SKU Model Application Primary Range Accuracy Scales 48201 MDX-201 NaCl / Salt solutions NaCl 0–28%, g/L 0–320, Brix 0–31% ±0.2% NaCl%, g/L, Brix, Refractive Index 48202 MDX-202 Seawater / Aquaculture Salinity 0–100 ppt, Specific Gravity 1.000–1.075 ±2 ppt Salinity (ppt), Chlorinity, Specific Gravity, Refractive Index Common Specifications — All MDX Models Property Value Brand VEE GEE Scientific Dimensions 4.8 × 2.3 × 1.3 in (122 × 58 × 33 mm) Display Large LCD — scale result + temperature simultaneously Temperature Compensation ATC — automatic, no manual correction required IP Rating IP65/67 (dust-tight, water-jet resistant) Sample Volume 4–5 drops Power 1 × AAA battery (included) Includes Hard shell case, disposable pipette, battery, user manual Quantity 1 Each Laboratory Applications Aquaculture and marine tank management — seawater salinity monitoring with the MDX-202 for coral reef systems, saltwater fish tanks, and marine hatcheries Wastewater and environmental monitoring — NaCl concentration measurement in industrial effluent and process water with the MDX-201 Food processing brine control — salt concentration monitoring in curing brines, pickles, cheese production, and fermentation tanks using MDX-201 Water treatment quality assurance — salinity and ionic concentration monitoring in desalination, RO permeate, and water recycling applications Frequently Asked Questions What is the difference between MDX-201 and MDX-202?MDX-201 (48201) is optimized for NaCl solutions — it measures sodium chloride percentage, g/L concentration, Brix, and Refractive Index. MDX-202 (48202) is designed for natural seawater and marine applications — it measures Salinity in ppt (parts per thousand), Chlorinity, Specific Gravity, and Refractive Index. For aquaculture and marine use, choose MDX-202. For industrial salt brine and food processing, choose MDX-201. Is MDX-202 accurate for artificial seawater mixes used in aquariums?Yes — MDX-202 measures real seawater salinity parameters directly. Both natural and synthetic seawater mixes refract comparably at equivalent salinity. Calibrate with deionized water before use. Can MDX-201 measure other chloride salts beyond NaCl?MDX-201 is calibrated specifically for sodium chloride solutions. Other ionic solutions will read on the Refractive Index scale, but the NaCl% and g/L scales will not be accurate for non-NaCl salt solutions. For broader ionic analysis, contact VEE GEE Scientific for application guidance. Quality Assurance VEE GEE Scientific MDX-Series refractometers are manufactured to IP65/67 standards with factory-calibrated prism assemblies. Each unit undergoes ATC performance verification and LCD display testing prior to shipment. The hard shell carrying case provides drop protection for field deployment. VEE GEE backs the MDX series with a 1-year warranty. 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