10 Best Refractometer For Reef Tank of September 2025

• Upgraded Quality
• Partable Hard Storage Box
• Dual Salinity Scale
• Automatic Temperature Compensation
• Full 12 Month Replacement Warranty

Magnum Media Salinity 10ATC

• Salinity range is 0-100ppt ; Brix range is 0~10% ; 1.000~1.070g/cm3 Density / DIVISION: 0.2% salinity ; 0.2% Brix ; 0.001g/cm3 density
• With Automatic Temperature Compensation (ATC) increase accuracy, easy to calibrate with mini screw driver included in the set
• Measure salt water or salinity of water, ideal for aquariums and marine monitoring
• Maintain proper concentration of your cutting and grinding fluids as well as check low concentrated salt and sugar solutions and food conten
• Comes with protective case and made with highest and finest quality of aluminum & rubber

Gain Express

• This latest salinity refractometer is designed for testing the concentration of salt water and brine and used for quality control in research and clinical laboratories and marine industry. Its scale provides a direct reading of the specific gravity and concentration (Parts per Thousand) of salt in water.

Aquarium Equip

• ✔ SPECIFICALLY DESIGNED REFRACTOMETER FOR SALTWATER AQUARIUM--The algorithm is made specifically for testing seawater and saltwater. This is different from a standard refractometer which is not calibrated to check salinity of aquarium water and will give an error in your readings.
• ✔ AUTOMATIC TEMPERATURE CALIBRATION --- The calibration process should be carried out with both the room and the instrument at 68° F. The refractive index of a liquid changes with temperature. Due to the automatic temperature calibration, any changes in ambient temperature from 50° F- 86° F will not affect the accuracy of the reading.
• ✔ EASY AND CLEAR READING FOR SALTWATER AQUARIUMS AND REEF TANKS--- The refractometer comes with a focus adjustment on the eyepiece, this will give you clarity of the optics and a sharp line for easy reading.
• ✔ COMES IN A SOLID CASE INCLUDES PIPETTE AND CALIBRATION TOOL --- This refractometer is not only built extremely well, but it comes with a durable hard case for easy storage of the refractometer when not in use. It also includes a calibration tool and a pipette.
• ✔ KEEP YOUR FISH AND PLANT LIFE IN OPTIMAL HEALTH--- Pure saltwater is crucial for the vitality of your marine or reef aquarium. Use this refractometer to measure the salinity of the water, the target level of salinity in a reef tank should be 35 ppt.

SunGrow

• With LCD display, the backlight can be switched for easy use in the dark
• Measuring range: 0.00ppt-9.99ppt, 10.0ppt-50ppt, very easy to test
• Hand-held design and non-slip pen handle for easy operation
• Built-in automatic temperature compensation (ATC) for precise results
• The temperature unit is °C/°F (switchable) to meet the needs of use in various environments

Oumefar

• Range: 0-100ppt (0-10% Salinity) and Density/ Specific Gravity 1.000-1.070 1ppt Salinity and 0.001 g/cm3 Density Resolutions
• Water or a salt (brine) refractometer preferred by aquarist, it checks saltwater & brine or salinity of water, best for aquariums and marine monitoring
• True seawater or a salt (brine) refractometer preferred by aquarist
• Calibrate simply by distilled water, comes with free screwdriver for calibration
• Has automatic temperature compensation (ATC) and has built with the highest and finest quality of aluminum & rubbe

Gain Express

• ✔ DUAL-RANGE SCALE REFRACTOMETER --- A healthy saltwater aquarium requires a salinity balance or the salt concentration in aquarium water. Refractometer by JOR helps maintain this fundamental parameter in your saltwater aquarium or reef tank, measuring both salt percentage and specific gravity. This measuring tool has a scale range of 0 to 100%, where 1% means one part per thousand (PPT) or 1000 parts per million (PPM) and with a corresponding specific gravity range of 1.000 to 1.070.
• ✔ PROVIDES ACCURATE MEASUREMENT READING --- Forget guessing and estimating. This handy refractometer features automatic temperature compensation that gives precise, faster and easier readings.
• ✔ EASY TO USE --- Place 2 to 3 drops of aquarium water on the glass, then close the plastic cover. Look through the eyepiece as you hold it under a light source. Check the reading. The blue line indicates the exact salinity level.
• ✔ HIGH QUALITY AND ECONOMICAL --- This premium quality handheld refractometer has an aluminum alloy body, rubber grip, and adjustable focus. It doesn’t corrode, and since it is analog, it can also save you money because it doesn’t need batteries to operate, sparing you from buying replacements.
• ✔ COMPLETE CARE SET --- This portable measuring device comes with a hard case for proper storage. It also comes with a cloth so you can wipe the prism plate. The kit also includes essential tools during calibration and testing, such as a suction tube, screwdriver and a user’s manual.

JOR

• 【Salinity Refractometer】Measure Salt Water or Salinity of Water,Monitor and Control the Concentration of Salt Water and Brine,Ideal for Aquariums and Marine Applications.
• 【Measures on 2 Scales】Specific Gravity (D 20/20) and parts per thousand and replaces your poor quality and difficult to read hydrometer.
• 【Density Measurement Range】1.0-1.070, Minimum Scale is 0.001.
• 【Concentration Measurement Range】0-100‰, Minimum Scale is 1‰.
• 【ATC】Automatic Temperature Compensation, 0-10°C.

AUTOUTLET

• DESIGNED FOR - testing the concentration of saltwater, help you to monitor and control the concentration of salt water.
• WIDELY USE - Can be used for Aquariums, Marine Monitoring, Agricultural, Gardening & Educational Purposes.
• EASY , ACCURATE & AFFORDABLE - This refractometer is more accurate and easier to use than traditional hydrometers, more affordable than digital refractometers.
• DUAL SCALE -- Provides reading of 0-100PPT(parts per thousand ) and corresponding specific gravity range 1.000 to 1.070. You can get the both result at just one test.
• AUTOMATIC TEMPERTURE COMPENSATION --The build-in Automatic Temperature Compensation feature makes it get consistently accurate reading, no need to control the liquids temperature deliberately, just make sure it's at roomtemperature .

aichose

• Measure salt water or salinity of water, ideal for aquariums and marine monitoring.
• With measurement level for direct reading. Adjustable manual focus, easy to focus and calibrate.
• Handheld design and non-slip rubber handle for easy operation.
• Instant Reading Result: Just need 2-3 drops of solution and a few seconds, you can get accurate readings.
• Built-in automatic temperature compensation(ATC) to get faster results.

KKmoon