1-800-566-3474

Marine Depot Aquarium Pro Refractometer

Read 40 Reviews Write a Review

In Stock: Order by 2PM EST for same-day shipping (M-F)

This item is in stock in our East and West Coast warehouses

$64.99  


MD2103

Add to Wishlist

SHIPS FREE!

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

MarineDepot.com carries more than 7,500 popular and hard-to-find aquarium supplies and fish tank accessories for saltwater and freshwater aquariums. You’ll find the top aquarium equipment and aquarium accessories from Hagen, Red Sea, Eheim, Coralife and many more. All of our aquarium pet supplies carry a 60-day money-back guarantee and we offer a Low Price Guarantee on all in-stock aquarium products. We ship 99.9% of fish tank supplies the same business day if you place your order before 6 PM EST. If you have any questions about fish supplies please do not hesitate to contact us. We’re here to help!


Warranty

12 Month manufacturer warranty.

40 Reviews

TD from AUSTIN, TX UNITED STATES

08/02/2016

Experience Level: Intermediate

Works as advertised

Works just fine. It would be nice if the case were longer so that the refractor can be stored while extended (focused).

Was this review helpful?

ANTHONY CAMERON from WINSTON SALEM, NC UNITED STATE

04/28/2016

Experience Level: Intermediate

A must have!

This is a must have tool for any marine aquarium. I love this thing! Easy to use and accurate. Thanks marine depot!

Was this review helpful?

JEFF BUNKER from CORONADO, CA UNITED STATES

04/11/2016

Experience Level: Intermediate

Accurate

Great device at a reasonable price. came calibrated, works great all reefers should have one.

Was this review helpful?

TIMOTHY ARMSTRONG from RALEIGH, NC UNITED STATES

02/21/2016

Experience Level: Intermediate

Good Tool

Easy to use tool for measuring water saltwater gravity levels!!

0 out of 1 found this review helpful

Was this review helpful?

JOHN CORDINGLEY from HUNTINGTON, WV UNITED STATES

09/01/2015

Experience Level: Intermediate

good

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.

0 out of 1 found this review helpful

Was this review helpful?

PHILLIP LEJA from Southfield, MI UNITED STATES

09/22/2014

Experience Level: Intermediate

Great Product!

I am very impressed with this product. It is well made and, above all, very accurate. I made the mistake of solely using an inexpensive hydrometer, which over time became inaccurate. Because of this my salinity dropped to very low levels and before I found the problem I had lost a few corals and a clam. This product is very easy to calibrate using R/O water and the sample only requires a couple drops of aquarium water! I will enjoy using this product and will not have to second guess the reading anymore.

1 out of 2 found this review helpful

Was this review helpful?

David OHRIN from READING, PA UNITED STATES

05/19/2014

Experience Level: Expert

Refractometer

The Marine Depot refractometer is much lighter than the model I am accustomed to which gave me the impression it may not be as sturdy as my previous model. However, the Marine Depot refractometer is more accurate. I have no idea why it is noticeably lighter but I would recommend it strictly due to it's accuracy. I have performed calibration tests with ro water and certified 35ppt synthetic calibration fluid-The Marine Depot model is more accurate than my previous more expensive model.

2 out of 2 found this review helpful

Was this review helpful?

RANDY CRAIG from HENRICO, VA UNITED STATES

01/20/2014

Experience Level: Intermediate

A great tool

I found the refractometer very easy to use. I like the fact that I now have readings on both salinity and specific gravity. Worth the expense in my opinion.

Was this review helpful?

THOMAS MILLER from MASTIC BEACH, NY UNITED STATES

10/15/2013

Experience Level: Intermediate

Pro Refractometer

This is very easy to read. Highly recommend this item for the serious aquarium buff.

Was this review helpful?

DEAN J from FEDERAL WAY, WA UNITED STATES

08/26/2013

Experience Level: Intermediate

Nice Unit

I love this new refractometer! The reason I purchased this is because of thescale that you see in the view finder. All the other brands out there all go up to 1.070 and the scale really small and a it difficult to read. And there is no need to go that high for reef tanks. This scale only goes up to 1.030 and the scale is larger and much easier to read and get accurate. I let it acclimate to the temperature for a little while then used RO water to calibrate and it was dead on. didn't even have to adjust. I just got this last week and I am extremely happy. I would highly recommend this to anyone wanting a good refractometer.

Was this review helpful?

Accessories for Marine Depot Aquarium Pro Refractometer


Similar Items