Marine Depot Aquarium Pro Refractometer

$49.99  

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Marine Depot Designed specifically for aquarium use to measure the salinity of natural sea water (NSW). Most handheld saltwater refractometers available in the hobby are designed and calibrated for testing brine solution, i.e. sodium chloride, and are not calibrated for the refractive index of natural sea water. This is a very important distinction: other salinity refractometers used for marine aquariums are designed to test saltwater and nothing else! The Marine Depot Aquarium Pro Refractometer is designed to measure the salinity of NSW taking into account all the other elements that comprise salinity in the marine water sample.

Even though the largest percentage of salt in the sea is sodium chloride, the presence of other significant ions such as magnesium and calcium in NSW results in a different refractive index to that of brine. A standard (brine) refractometer will therefore not give the correct salinity for NSW and a conversion factor must be applied.

For example, a 35 ppt (parts per thousand) solution of NSW has the same refractive index as a 36.5 ppt solution of brine. When using a brine refractometer, an aquarium hobbyist should therefore look for a reading of 36.5 ppt when trying to achieve a reading of 35 ppt for NSW.

Easier to Read

One of the other problems with most refractometers is the scale displayed normally reads from 0-100 ppt when we are really only interested in the region from 30-40 ppt. The Marine Depot Aquarium Pro Refractometer has therefore been specifically designed to read from 1.015-1.030 which gives you much better resolution of a normal 1.000-1.070 scale.

  • Marine Depot Aquarium Pro Refractometer
  • Protective Hardshell Case
  • Pipette
  • Soft Cloth
  • Calibration Screw Driver



Manufacturer Info

Marine Depot was started in 1998 by a self-professed reef geek and premed student Ken Wong. Ken envisioned a one-stop shop where customers could find everything they needed, from technical product specifications, reef aquarium information, expert advice on the hobby and friendly one-on-one customer support. Having grown from a one-man crew to being one of the world’s largest suppliers of reef and marine aquarium products, this very core philosophy still lives strong in the Marine Depot culture 17 years later.


Warranty

12 Month manufacturer warranty.

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9 Questions
Displaying questions 1-9
 
Q
how to calibrate this refractometer?
If the scale does not go to zero, how can it be calibrated?
Asked : Jan 17, 2017
By : Paula, NH
 
 
 
A
The scale actually does go to zero. It is indicated by "---- ZERO----" at the bottom of the scale. The Pro refractometer can be calibrate with either RO/DI water or a calibration solution such as the Two Little Fishies AccuraSea. Let us know if you have any other questions.
Answered : Jan 17, 2017
By : MD Tech
 
 
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Overall, others give this:

  • 4.5

42 Reviewers (91%) would recommend this

Overall Rating:

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5  Star
 30
4  Star
 7
3  Star
 1
2  Star
 3
1  Star
 1
 
2
2.0
Difficulty reading

PROS
Easy to handle
CONS
Can not read the scale without glasses
REVIEW
The font size is so small that I have to use reading glasses to see the reading.
  • 0
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5
5.0
Seawater refractometer vs. salinity refractometer

PROS
Seawater refractometer, not salinity. Well made.
CONS
I'd prefer a black one
REVIEW
More convenient to calibrate with RO/DI than the salinity solution I had to get for my other salinity refractometer. No temp or salinity vs. seawater conversion necessary, keeps itself calibrated. Good price, and for what it's worth it's much heavier, better built, better clarity than my old unit.
  • 1
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5
5.0
Accurate

REVIEW
Great device at a reasonable price. came calibrated, works great all reefers should have one.
  • 1
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5
5.0
A must have!

REVIEW
This is a must have tool for any marine aquarium. I love this thing! Easy to use and accurate. Thanks marine depot!
  • 1
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5
5.0
Good Tool

REVIEW
Easy to use tool for measuring water saltwater gravity levels!!
  • 1
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5
5.0
Works as advertised

REVIEW
Works just fine. It would be nice if the case were longer so that the refractor can be stored while extended (focused).
  • 1
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4
4.0
good

REVIEW
The refractometer works well with a single caveat. I would have preferred the scales to go all the way down to zero. Otherwise no complaints.
  • 1
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Overall, others give this:

  • 4.5

42 Reviewers (91%) would recommend this

Overall Rating:

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5  Star
 30
4  Star
 7
3  Star
 1
2  Star
 3
1  Star
 1
 

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