Refractometer for Reading Salinity with Calibration Fluid

Refractometer for Reading Salinity with Calibration Fluid
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Refractometer for Reading Salinity with Calibration Fluid

98% Recommend this to a friend (422 of 432)

SKU: 205171

reg. $39.99

Special Price: $35.99

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Quick Overview

Why does BRS recommend this?

If you have been using a hydrometer and have never tried a refractometer then you should really invest in one.  They use much less water, and can easily be calibrated for accurate repeatable readings.  For the most accurate readings  you will want to calibrate the refractometer to the solution you will be reading, and that is why we always include a bottle of Aqua Craft Calibration Solution at 35ppt (1.026sg) to keep your reef tanks salinity spot on.

Must have equipment for aquarists! Easily and accurately measure the salinity of your tank. Simple to use and read. This unit automatically compensates for temperature. FREE Salinity Calibration Fluid included. Calibrating your unit ensures correct salinity readings.


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Product Questions

*** Do not calibrate using RO/DI water as this will not give accurate readings***
All my water is from RO/DI water, how do you calibrate this?
Question by: Larry on Dec 23, 2013 11:14:00 AM
Hey Larry,
You calibrate it using the included 35ppt/1.026 calibration solution. The solution is a known standard, so you put that on the slide and then adjust the refractometer to 35ppt/1.026.
Answer by: Bulk Reef Supply on Dec 23, 2013 11:14:00 AM
Is this unit calibrated specifically for seawater? Or seawater and brine. I was looking at red seas refractometer and theirs is calibrated for seawater only. I know that brine differs from seawater.
Question by: jeremy on Jan 17, 2016 7:09:00 PM
Great question!
The refractometer is set up for levels around 1.026 SG or 35 PPT. Unfortunately these are not designed for brine water levels. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jan 26, 2016 6:39:00 PM
Does this have an adjustable eyepiece? These old eyes require it to focus right.
Question by: Tom Coon on Mar 24, 2016 5:08:00 PM
Great question!
This will have an adjustable eye piece for focus. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 24, 2016 5:20:00 PM
what is the accuracy +/-
Question by: John Shannon on Mar 12, 2016 5:07:00 PM
Great question!
When calibrated the accuracy will be +/- 0.01 SG. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 14, 2016 4:11:00 PM

Full Details

Refractometers are one of the best pieces of equipment an aquarist can purchase. It not only ensures accurate measurements of salinity but it is also infinitely easier to use and read.


Range: 1.000 - 1.070 SG


Comes with the following:

  • Dropper
  • Carrying Case
  • Screw Driver for calibrating
  • Adjustable eyepiece
  • Salinity Calibration Fluid. Calibrates to sg 1.026 (35ppt)


Steps to calibrate your unit:

1) Using the dropper place a few drops of the solution on the glass and close the lid.

2) Looking through the unit and turn the screw until the unit reads sg 1.026 (35ppt)

3) Screw the cap back on your calibration solution for storage. It is important that the cap is on tight or water will evaporate and ruin the solution.


*** Do not calibrate using RO/DI water as this will not give accurate readings for saltwater aquariums***



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  • Spot on By Michael on 10/15/2016

    Worth every penny, spot on.
  • Easy to use and accurate. By Scott on 10/11/2016

    This a very nice unit for the price. Comes with everything you need to calibrate it, instructions and a nice case to store it.
  • Seems good so far By Hambone on 10/7/2016

    Seems good so far
  • Works as described By Travis on 10/6/2016

    The unit is easy to calibrate with the included solution and works as described. The only issue is that i'm not totally convinced it's worth double than those found on amazon. The unit isn't brand named, and the included instructions have tons of grammatical errors.
    Just for kicks, I compared this to a hydrometer I had laying around. The hydrometer read 1.023 while the refractometer was 1.025. The first thing you should do is buy one of these and throw your hydrometer in the recycle bin.
  • Must Have for Saltwater Tanks By Steelsoul on 8/15/2016

    The summary says it all, this is a must have for all saltwater aquarium owners. The refractometer comes preset for the most part, just make sure its in focus used like a monocular. Open clear lid, use eye dropper that's provided with kit to get a drop of water you want to test, close lid and hold it up to light, very easy to read and super accurate. I realize your thinking $40 for a refractometer or like $8 for a cheap float type, well just pay the $40 you will never regret it! The $8 cheap float will prolly work for a yr and wont be half as accurate as the hydrometer and until your fish suffer cuz your salinity is off and you cant tell because of the cheap float and you figure it out after losing your $100 fish or more. It comes with calibration fluid in case calibration is off, just buy it even a novice and follow the instruction on use.
  • A Must For All Reef Tanks By Yuri on 8/1/2016

    I don't know why I waited so long to get a refractometer, this is so much easier and more accurate than a hydrometer. Bundled with the calibration fluid is a plus, even if you look at Amazon if you purchase the refractometer plus the calibration fluid it is around the same price, I'd rather order from BRS because I know what I am getting.
  • great tool, easy to use By sweetelfmaiden on 7/18/2016

    easy to use. comes with calibrating fluid, very handy. instructions are clear. I like the storage case which offers good protection.
  • Accurate By Dale on 6/27/2016

    Product is very accurate and well built. Highly recommend.
  • Great Product By Mark on 6/23/2016

    I have the Milwaukee M887 digital refractometer and I have to say that I think this ATC refractometer is much more reliable. Using the calibration fluid with this device is a breeze. Simple to use and this is a must have item for any saltwater hobbyist. I recommend this over "big green".
  • Excellent By Dan on 6/13/2016

    Very good quality, easy to calibrate, easy readings.
  • Super and accurate! By FLSharkvictim on 5/6/2016

    I don't know how I been getting by with the Instant Ocean Hydrometer that I have been using for all these years! I finally broke down and bought the Refractometer. Wow, what a big difference between the two reading that i was getting.. I was getting a reading of 1.028 w/ the Hydrometer and w/ the Refractometer my reading was perfect 1.023, right where I like to keep my tanks at. If you're going to get into this hobby this is a must buy! HIGHLY recommended...
  • Accurate & Consistent Measurements By Paul on 5/4/2016

    Multiple measurements are consistent and with the 1.26 calibration solution they are accurate.