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 (438 of 449)

SKU: 205171
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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
Whats different between the less expensive ones and this? Looks the same and is calibrated for seawater.
Question by: Mike J on Jan 15, 2017 4:43:00 PM
Great question! We carefully select our products here at BRS and we have tested many of these refractometers. We recommend this over the others we have tested, due to its build quality, accuracy, and life of calibration. :-)
Answer by: Randy (Admin) on Jan 16, 2017 12:58:00 PM
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
So the number I read is the one right below the blue right? Sorry I'm new to this. Thanks.
Question by: Anthony Almirall on Dec 29, 2016 10:03:00 PM
Great question! You are correct! Your reading will be the line that is closest to that blue/white division line. :-)
Answer by: Randy (Admin) on Jan 9, 2017 8:30:00 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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  • Love it By DW on 4/21/2017

    Went from 2 instant ocean hydroneters tbat read different numbers consistently. Not just different from each other, but even after tapping bubbles out I'd never get the same two readings...

    Yea, I'm good..
    Got this guy and love it. Only complaint is I should have purchased it sooner
  • Fantastic product By Lerch on 4/2/2017

    This is my first time using a refractometer and I love this product. Very accurate and easy to use. I no longer worry where my salinity value is at.
  • A Necessity By Michael on 3/31/2017

    Been out of reef keeping for over 10 years. Starting back up and bought the usual floating dial salinity monitor as I was use to. Saw the great price and had to quickly upgrade. So glad I did salinity levels were not even close floating needle when filling tank said 1.025 checked it with this after quick calibration check and found I was only at 1.021. Glad I was only starting the tank and not relying on the cheap gauge when I begin to add aquatic life to the tank.
  • Much better than Red Sea By Michael on 3/25/2017

    I had the Red Sea refractometer and was concerned that it could lose calibration in minutes. This unit is much easier to read, feels better built, better price, and seems to hold calibration better. Highly recommended.
  • A must have By Chad on 3/25/2017

    I use this constantly. Whether making fresh salt water or acclimating fish or corals it is always being used.
  • Great item! By Mamatoby on 3/18/2017

    We've needed a refractometer for some time. After searching and searching, I decided to come to brs. I just couldn't trust other sellers. Once received, my husband fell in love with it! It's simple to use. For those that complain about the lines being too close, you either probably want to get your eyes checked or focus it until you can read it. I wear glasses and it was super blurry when we got it. Did some fine tuning and it's perfect now. We love it. We recommend it! Thanks brs!
  • Perfect By Chad on 3/3/2017

    Works great and is easy to use.
  • Works Great - Easy to Use By Jason on 1/14/2017

    Works great and easy to use. Comes with everything you need and it makes checking the salt level very quick.
  • Love it By Kyle on 1/14/2017

    Love it works as it suppose to I do wish the lines where a little bit bigger. But other then that I finally got to see how bad my hydrometer was off.
  • Very hard to see in the eye scope By Tony on 1/9/2017

    This would be my third refractometer. My previous two were purchased at a LFS and worked very well. The numbers were large and light flow was good. I ordered this refractometer from BRS because it was cheaper, and I like getting preferred reefer points.

    When it arrived, I immediately tried it out. The numbers were very small, the lines were compact and worse, the light going through the prism was very limited. I turned on all the lights in my house and still could barely see through the refractometer. Compared to my other two refractometers, this one is terrible. I'm not sure why everyone gives it such high ratings, but maybe they haven't used a good refractometer to compare... Or, the one I received was just a defective to start. I emailed BRS to ask for an RMA number for a return.
  • Great purchase By Eric on 1/1/2017

    Didn't know just how far my plastic tester was off....but hey I had it for several years, how old is yours? This tools is easy to use and you won't be disappointed!
  • Excellent Product and Amazing Service By pray4urlife12 on 12/29/2016

    Despite BRS being one of the most busy sites, especially around the holiday season, they were able to get me my refractometer well before the promised date. I was running blind on salinity and was moving out in 6 days and BRS took action without me asking. I look at the shipping method in the order email and they bumped me up to 2nd day air. Thank you so much for saving my corals and myself from a headache. I will surely continue to shop here first. This refractometer is solid and accurate. No cheap parts here. Also, thanks for your helpful youtube videos!