10 Best Aquarium Refractometers 2021

Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT – ⭐ Best Overall Aquarium Refractometer

WL0020-ATC by Agriculture Solutions

• Weight: 0.55 pounds
• Dimensions: 2 x 3 x 8 inches

• 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

8541957181 by aichose

• Weight: 0.23 pounds
• Dimensions: 7 x 1.5 x 1.5 inches

• 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 .

AUTOUTLET Refractometer Saltwater Aquarium for Seawater

8541957195 by AUTOUTLET

• Color: Salinity Refractometer
• Weight: 0.53 pounds
• Dimensions: 7.9 x 3.5 x 2.4 inches

• 【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.

Professional Automatic Temperature Compensation Salinity Refractometer for Aquariums – 👑 Premium Pick

SR007-10ATC by Magnum Media Salinity 10ATC

• Color: Black
• Weight: 0.35 pounds
• Dimensions: 8.1 x 3.2 x 1.7 inches

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

RZ Aquariums Salinity Refractometer for Seawater Marine Fish-Keeping

by RZ

• Color: Salinity Refractometer

• 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

JOR Refractometer – 💲 Best Budget Aquarium Refractometer

by JOR

• ✔ 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.

AccuBrate Refractometer Salinity Calibration Fluid

8541957208 by Aquatic Experts

• 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.

SunGrow Measure Salinity of Water with Aquarium Refractometer

by SunGrow

• ✔ 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.

AquaticHI Aquarium Refractometer for Saltwater/Brackish/Marine/Reef Tank Testing

14871189 by AquaticHI

• Weight: 0.46 pounds

• ⭐️ 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

TRZ Salinity Refractometer for Aquariums

Hamh Optics&Tools by TRZ

• Color: silver and black
• Weight: 0.4 pounds
• Dimensions: 7.5 x 2.2 x 1.4 inches

• It is more accurate than a hydrometer and easy to measure. Designed for the testing the concentration of salt water and brine, perfect for use with aquarium Marine monitoring and quality control in scientific research and clinical laboratories
• Measurement range: Salinity 0 - 100 ppt, (0 - 10% salt content), SG 1.000 to 1.070 SG, Resolution: Salinity +/-1 ppt; +/-0.001 SG
• 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.
• The refractometer's body and the retaining ring are made of brass and chrome plated. The internal optical lens with high refractive index make up the precision optical system.
• Please ignore reviews from Diver. This commentator has a suspicion of being hired. Seller opponents use unfair means to compete！