Best Refractometer For Saltwater Aquarium

Red Sea Seawater Refractometer
Our Top 20 Best Refractometer For Saltwater Aquarium list was created by The Man Post founder, Paul Crouch, to help users find products that are useful, affordable, and available. The list is updated every month.

Best Refractometer For Saltwater Aquarium

Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT with Automatic Temperature Compensation

$19.88  in stock
as of May 20, 2022 7:04 pm


  • Measure salt water or salinity of water, ideal for aquariums and marine monitoring.
  • Measures on 2 scales, Specific Gravity (D 20/20) and parts per thousand.
  • Features automatic temperature compensation.
  • Comes with hard case, dropper, screwdriver, user manual and cleaning cloth.
  • The main part is made of chromium, it's very durable.

Aquarium Salinity Refractometer with ATC Function,Saltwater Test Kit for Seawater, Pool, Aquarium, Fish Tank.Dual Scale: Specific Gravity & Salt Percent

$17.99  in stock
as of May 20, 2022 7:04 pm


  • 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 .

RZ Aquariums Salinity Refractometer for Seawater Marine Fish-Keeping, Dual Scales Specific Gravity Salinity Meter Hydrometer 0-100ppt & 1.000-1.070, Saltwater Tester with ATC Function

 in stock
as of May 20, 2022 7:04 pm


  • Measures on 2 Scales: Aquariums refractometer features Specific Gravity (D 20/20) 1.000-1.070sg and parts per thousand 0-100PPT (1‰=1ppt=1000ppm)
  • Seawater refractometer measures saltwater or salinity of water, ideal for aquarium, marine monitoring, fish-keeping,salty pools&spas and etc.
  • ATC Function: salty water refractometer with automatic temperature compensation, allow you obtain accurate readings easier and faster
  • Salinity Refractometer is made of aluminum body and ABS rubber light and very sturdy, comes with a hard plastic case, a mini screwdriver, a dropper
  • Easy to Use: put 2-3 drops on the saltwater’s prism, towards light then to get the accurate readings through the optic eyepiece, ideal for replacement the poor quality and difficult to read hydrometer refractometer

Salinity Refractometer for Aquarium, Marine Monitoring, Saltwater Testing, Dual Scale Salinity Tester 0-100 PPT& 1.000-1.070 Specific Gravity Saline Seawater Refractometer Hydrometer with ATC

 in stock
as of May 20, 2022 7:04 pm


  • DUAL SCALES - Saltwater Refractometer measures on specific gravity (D20/20) 1.000-1.070 and parts per thousand 0~100‰, you can get the result in two different units by one test
  • WIDELY USE - The Refractometer designed for Aquariums, Marine Monitoring, Agricultural and Educational Purposes. Help you to control concentration of salt water easily
  • EASY TO USE - Put 2-3 drops of sample solution after calibration on prism, towards light, then get the accurate readings. Aquarium refractometer is ideal for replacement salinity hydrometers or expensive digital salinity tester
  • ATC FUNCTION - Aquarium hydrometer features Automatically Temperature Compensate function and always provide you accurate readings fast
  • DURABLE & PORTABLE - Saline refractometer is made of aluminum and ABS rubber, anti-rust, non-staining and resistant abrasion, sturdy for long time use. Portable refractometer with plastic case easy to carry

AccuBrate Refractometer Salinity Calibration Fluid – 60 ml Solution to Accurately Calibrate Refractometer for Testing Natural Saltwater or Synthetic Sea Water - Made in the USA (60 ml)

$9.99  in stock
as of May 20, 2022 7:04 pm


  • REMARKABLE PERFORMANCE! Accubrate calibration solution is specifically formulated to calibrate refractometers to accurately measure the salinity of saltwater, reef aquariums as well as natural seawater.
  • ACCURATE RESULTS! Our calibration solution is formulated from a high purity blend of salts to produce accurate readings every time. Refractometers must be calibrated often to obtain accurate readings. Note: RO/DI water will not calibrate your refractometer correctly. Always use Accubrate to ensure correct salinity readings - your aquatic friends will love you.
  • EASY TO USE: Our specially designed bottle has a built-in dropper tip which eliminates the need for a pipette. Simply squeeze a few drops of Accubrate directly from the bottle onto the refractometer’s prism slide and you are ready to calibrate your instrument. (Drops come out at a very controllable rate.)
  • LONG-LASTING: You need just 2 to 3 drops of our calibration solution to calibrate a refractometer. Using a few drops means our 60 ml bottle should last a very long time. For best results calibrate refractometer often to ensure accurate readings.

Professional Automatic Temperature Compensation Salinity Refractometer for Aquariums, Marine Monitoring, Saltwater Testing.Dual Sacle: 0-100ppt & 1.000-1.070 Specific Gravity

$22.00  in stock
as of May 20, 2022 7:04 pm


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

SunGrow Measure Salinity of Water with Aquarium Refractometer, Remarkable Accuracy, Easy Reading

$14.95  in stock
as of May 20, 2022 7:04 pm


  • 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.
  • 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.

Aichose Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium, Saltwater Pool, with ATC Function, Dual Scale: Salinity 0-100‰ and Corresponding Specific Gravity

$19.99  in stock
as of May 20, 2022 7:04 pm


  • It is designed for the measurement of seawater or low concentrated saltwater.
  • Dual scale: 0-100‰ salinity and corresponding specific gravity 1.000-1.070
  • Automatic temperature compensation function minimizes the effect of the temperature on testing result.
  • Easy to Use: It's very easy to use even for new users. And no battery needed.
  • Ideal for marine fishkeeping aquarium, saltwater pool, marine monitoring,lab,agricultural, gardening and educational purposes.

AUTOUTLET Refractometer Saltwater Aquarium for Seawater,Pool,Tank,Testing,Marine Fishkeeping, 0-100PPT & 1.000-1.070 Salinity Tester with ATC Function Hydrometer Specific Gravity Salinity Meter Kit

 in stock
2 new from $16.99
Free shipping
as of May 20, 2022 7:04 pm


  • 【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.

Red Sea Seawater Refractometer

 in stock
3 new from $54.95
as of May 20, 2022 7:04 pm


  • Directly reads the absolute salinity of seawater at 25°c/77 0f  ( no need for seawater or temperature compensation factors)
  • Specifically designed for the ionic content of seawater (NSW)
  • Calibrated for seawater (NSW) at 25oc/77of (most standard refractometers are calibrated at 15oc/59of )

capetsma Salinity Tester, Accurate Sea Hydrometer Aquarium Marine Salinity Meter for Fish Tank Pond Water Saltwater Freshwater Specific Gravity Test

$11.99  in stock
as of May 20, 2022 7:04 pm


  • Safe Material & Unique Design: Made of durable Acrylic, this Fish Tank Test Kit salinity Hydrometer is designed with an automatic level function.
  • Quickly, easily, and accurately measurement: With this hydrometer saltwater aquarium test kit, you can test your marine aquarium's salt level and specific gravity, and It is optimum to be put into below 6" deep water to avoid the error caused by the oil film on the water.
  • Higher Accuracy & safe zone indicated: Readings are temperature-corrected & accurate to +/- 0. 001. specific gravity units ranges from 1. 000 - 1. 030 with a safe zone of 1.020-1.023. The outside range of scale indicates salinity ppt, ranges from 0-40, safe zone is 27-31.
  • Easy to Read & Clean: The easy-to-read swing-arm pointer and extra wide stable base provide an accurate test result. After use, soak this saltwater meter in mild acid(vinegar) for 30 minutes, rinse with tap water and air dry. Do not disassemble.
  • Wide Usage:Fit for brackish and reef salt marine aquariums. Perfect for testing both salinity and specific gravity of your brackish and marine tank.Includes salinity and specific gravity scales.Suitable for fresh water and sea water.

JOR Refractometer, Dual-Range Scale Device to Measure Salinity and Specific Gravity of Saltwater Aquarium and Reef Tank, Provides Accurate Reading, No Batteries Required, 1 Set per Piece

 in stock
as of May 20, 2022 7:04 pm


  • 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.

Seawater Salinity Refractometer,V-Resourcing Automatic Temperature Compensation Sea Water Salinity Measurer for Aquarium, Hydrometer, 0-100ppt & 1.000-1.070 Salinity Specific Gravity

 in stock
as of May 20, 2022 7:04 pm


  • Automatic Temperature Compensation: 10℃~30℃
  • Measuring range: salinity: 0-100 ‰, Specific Gravity : 1.000 to 1.070
  • Minimum scale: salinity: 1 ‰, Specific Gravity : 0.001
  • Resolution: salinity: ±1‰, Specific Gravity : 0.001 mm
  • Perfect for salty water tank and aquarium, seafood water tank, salty pools & spas and etc

Salinity Refractometer for Aquarium Dual Scale Salinity Tester 0-100‰ & 1.000-1.070 Specific Gravity Saltwater Tester Brine Refractometer Hydrometer with ATC Function

$15.96  in stock
as of May 20, 2022 7:04 pm


  • DUAL SCALE - Salinity Refractometer measures on 2 scales: Specific Gravity 1.000 to 1.070 (D 20/20) and 0-1000PPT, which allow to get the both results at just one testing
  • EASY TO USE - The aquarium refractometer need few sample, put 2-3 drops on prism and towards light source, you can get the the accurate readings quickly from eyepiece
  • WIDELY APPLICATION - Brine refractometer can be used for measuring salt water, salinity of water and seawater, ideal for monitoring aquariums, Marine Fishing Keeping, Agricultural, lab experiment and Educational purposes
  • ACCURATE & AFFORDABLE - Salt water refractometer features ATC (Automatic temperature compensation) function to ensure get consistently accurate reading. Easy to operate than traditional hydrometers and more affordable than digital refractometer
  • DURABLE & PORTABLE - Saline (brine) refractometer is made of aluminium and rubber, non-rust, anti-abrasion and durable for long time use. Comes with plastic storage box, small screwdriver and cleaning cloth, easy to organize and carry with

AquaticHI Aquarium Refractometer for Saltwater/Brackish/Marine/Reef Tank Testing, Automatic Temperature Control, Salinity (0-100ppt) and Specific Gravity (1.000-1.070) (Standard Kit)

$19.99  in stock
as of May 20, 2022 7:04 pm


  • ⭐️ DUAL SCALE REFRACTOMETER: Measures in Salinity 0 - 100ppt and Specific Gravity 1.000 - 1.070
  • ⭐️ IDEAL APPLICATIONS: Aquariums, Marine Monitoring, Agricultural, Gardening & Educational Purposes (Biology Projects)
  • ⭐️ AUTOMATIC TEMPERATURE COMPENSATION (ATC): Automated to provide accurate measurements even with temperature fluctuations
  • ⭐️ AFFORDABLE high quality while providing ⭐️ PROFESSIONAL testing equipment standards, accurate even at low salt levels
  • ⭐️ STANDARD PACKAGE INCLUDES: 1 Refractometer, 1 Hard Carrying Case, 1 Calibrating Screw Driver, 1 Pippet, 1 Cleaning Clothe, 1 Instruction Manual

Refractometer Salinometer, Seawater Salinity Meter Aquarium Optics Refractometers Temperature ATC Digital 0-10% Aquarium Sea Water Pool Tank Brine Marine Fishkeeping Hydrometer Measurement Tool

$21.09  in stock
2 new from $21.09
Free shipping
as of May 20, 2022 7:04 pm


  • [ MEASUREMENT RANGE ]: 0 to 10% salinity, 0.01% Study accuracy.
  • [ STRUCTURE & DESIGN ]: Copper construction, main prism + daylight plate + calibration screw + rubber grip + focus adjustment + eyepiece. You can adjust the prism when you can not see scale clearly. The Soft rubber eye piece makes you have a comfortable viewing.
  • [ EASY TO USE ]: Place 2 drops sample on the main Prism and close the panel and hold the refractometer up to the light and look through the eyepiece.
  • [ WIDE USAGE ]: the salinity refractometer can test the concentration of salt water, perfect for aquarium marine monitoring in scientific research and clinical laboratories.
  • [ FULL KIT ]: 1 x Storage Case with Inner Protective Tray, 1 x Salinity Refractometer, 1 x Mini Screwdriver, 1 x Cloth, 1 x Pipette, 1 x Instruction Manual.

CORISRX BEST OF YOUR LIFESTYLE Dr. Marine Saltwater Marine Aquarium Salinity Portable Refractometer Meter ATC 0~10% Reef

$63.65  in stock
as of May 20, 2022 7:04 pm


  • 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.

Fritz Aquatics 35ppt (1.026sg) Refractometer Calibration Solution 2 oz - Fritz

$6.79  in stock
4 new from $6.79
Free shipping
as of May 20, 2022 7:04 pm


  • 35 ppt or 1.0264 Specific Gravity
  • 1.3394 Refractive Index 53 uS/cm at 25 deg C

Digital Salinity Tester for Salt Water - Waterproof IP67 Salinity Meter with ATC Large Range 0-200ppt Saltwater Tester for Seawater, Aquariums, Marine Monitoring, and Koi Fish Pond by ORAPXI

 in stock
as of May 20, 2022 7:04 pm


  • Salinity Range: 0~9999ppm/10~200ppt or 0.0-25%, ORAPXI salinity tester has an automatic temperature compensation function(32°F~140°F), which can decrease the error caused by the change of liquid temperature.
  • Wide applications: There are various purposes for the salinity tester. This instrument can not only detect the salt content of edible salt, salt water pool and koi fish pond, but also the salinity of seawater, marine, salt water fish tank salt level testing.
  • Backlit design: There is no need to worry about seeing the displayed value if the light is insufficient. ORAPXI salinity meter features a green backlit LCD to help you see the measurement results clearly in any situation.
  • 4-in-1 salinity tester: The multi-parameter Tester can test Salinity, TDS, EC and Temperature in an accurate, quick and reliable manner for most regular water solutions' testing. Support One-tap switch from salinity to TDS/EC.
  • After-sales: 30-day free return/replacement and we promise respond your any questions about the product within 12 hours.

Coralife Energy Savers ACLAF877 Deep Six Hydrometer

$12.99  in stock
7 new from $12.99
Free shipping
as of May 20, 2022 7:04 pm


  • Coralife is one of the market’s leading manufacturers of premium aquarium products.
  • Coralife's Hydrometer takes a true water sample at six inch depth.
  • Easy to read and accurate this specific gravity meter is designed to give temperature-corrected readings in warm water aquariums.
  • Cora life is one of the markets leading manufacturers of premium aquarium products
  • Cora life's Hydrometer takes a true water sample at six inch depth

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