Nitrate REEFER Test Kit - NYOS

nyos nitrate stock
Click on image to zoom
View full size image

More Views

  • nyos nitrate stock

Nitrate REEFER Test Kit - NYOS

92% Recommend this to a friend (11 of 12)

SKU: 208967
In Stock: 62
Please wait...
Ships Free Today
11h 6m

365 Day Returns

What's This?

Preferred Reefers
Earn Up To 5% Back

Quick Overview

High sensitivity seawater nitrate test kit for the professional reefer

  • Highly sensitive reagents

  • Professionally calibrated color chart

  • Differentiated color gradations

  • Precise sliding comparator

  • Sample tubes made of glass

Number of Tests: 40

Measurement Range: 1 – 160 mg/l NO3


Full Details


NYOS® REEFER test kits - taking measurements at the laboratory level at an attractive price

Water properties as close to nature are the key for every aquarium's success. However, monitoring relevant parameters in seawater is difficult due to numerous interfering ions. Therefore, test kits considering the specific characteristics of seawater are needed to analyze the water precisely.

NYOS® REEFER test kits offer the customer two significant benefits:

Highly precise analyses for seawater conditions. Furthermore, they offer a highly attractive price-performance ration and make test kits in laboratory quality affordable for the standard hobby user.

Additional characteristics of our REEFER test kits:

  • calibrated dropper made by a German manufacturer ensures uniform drops during all repeat tests
  • reagents are made in Germany in accordance with EN ISO 9001
  • reagents are analyzed according to AAS and NIST standards
  • strict batch and quality control
  • easy to use with intuitive pictogram instructions
  • Made in Germany

NYOS® REEFER test kits allows you to achieve precise and most importantly reproducible (i.e. in repeat measurements identical) measuring results.


12 Items

  • Be Careful, inspect your reagent powder upon opening By BH750 on 7/3/2017

    I purchased this based on the BRS video on test kits. I really wanted to know my NO3 readings. So upon getting the kit I tested almost daily. Readings were always low (3-5ppm) and consistently. . I was happy b/c NO3 were stable. After awhile the reagents ran out so I recently ordered another one. I immediately noticed the reagent powder in the new kit looked different. Its really white (more like expected) while the reagent powder in the kit purchased in March was tan/brown. My N03 tests using the new kit are now completely different. NO3 is way higher (12-15) and kinda what I expected. I did parallel tests with the old reagent powder and still low (3-5ppm). So the reagent powder seemed to be bad in the first kit. And I used it to get incorrect readings and guidance for months! Very disappointing since you have to put so much trust into these kits and I bought it based on BRS endorsement. I still like the kit and will do a new review after using the new powder. Just check the powder and make sure it looks white.
  • Highly recommended, be careful with lids! By Michael on 3/25/2017

    I really like this test kit. It's easy to use, far more accurate than some other brands. Another reviewer mentioned the warning about caps. The lid for your test vial is the same lid as for the regent. If you're not careful, you might put a damp lid on the regent and ruin your kit. So watch out for out, but I'm definitely buying another one when the time comes.
  • Really Easy Nitrate Kit By Kap18512 on 10/26/2016

    This kit was super easy to use. It was really accurate and helped me recognize the issues I had in my tank. It was a great purchase.
  • High Quality NO3 Test By Pros4ever on 9/20/2016

    Compared to Red Sea and API the quality is better. You do have to judge between two values but you can quickly find the range easily.
  • Best nitrate kit By medtoad on 9/16/2016

    Love this kit. I'm not sure that you can actually get a reading of zero as I think it looks slightly yellow after just adding the drops and before the powder. But otherwise, it's been a great kit and worked beautifully watching my nitrates decrease to (almost?) zero after starting carbon dosing. Super easy to perform and to read.
  • Easy to read! By Mark on 7/25/2016

    I bought this because BRS recommended it and I'm glad I did! Red Sea's nitrate test is easy to read but I find this one easier to read.
  • Easier to read but falls short in other areas By Ryan on 6/14/2016

    Good test kit which is easier to read the Red Sea. I have a couple of issues with it. Scale jumps from 12 to 25 with a lot of room for interpetation. Nyos needs to fine tune that. Cap for vial is same for powder agent. Should make different color so you don't put wet cap on powder. It's an easy test to conduct, but I wish someone would figure out how to get an easy to read measure. This is better than most but still falls short. Good not great
  • Favorite so far By sjohnson2152 on 2/24/2016

    I have used Seachem and Red Sea's Nitrate test kits and so far I prefer this one because I find it easier to run the test in general, uses less water (than Red Sea), gives the results faster, and comparing the result colors is slightly easier, although you still have to make a guesstimation just like all the other kits. My results with it seem consistent to my Red Sea results.
  • Excellent Product By Reefbobc on 1/18/2016

    Kit is easy to use and the results seem to be accurate. A little less money than the Elos and is every bit as good!
  • Best Nitrate Kit I've come across By Mike on 12/5/2015

    This test kit is the easiest to read. Way easier than Salifert or Red Sea. Results seem to match up with Salifert. I was so impressed with this kit I went out and bought a NYOS rocks too...but thats another review.
  • Excellent By Alan on 10/29/2015

    Every one has a personal opinion, but I honestly do think that this is the best test kit for nitrate. It is much easier to decide which color to choose to determine the nitrate level in your system. I am extremely pleased with the Nyos Nitrate test kit.
  • Most accurate & east to interpret NO3 available! By Reefknight on 9/15/2015

    I have used Salifert, Red Sea, API, Seachem, Aquarium Systems and Elos over the years. Until now Elos was hard to beat, but you still had to really make the final call on that varying shade of pink. With the Nyos NO3 kit you run the control sample and and compare the two on the chart which is much easier to do. You may run into a situation where you have to make a call between two values, but its much easier to do with the control sample as a known. If Nyos could improve the low end color scale a bit, fine tune it, and add release the Pro version in the USA this would be a 5 star! The Pro version has double the reagent. I only believe in buying the best kits, this is it until a photometer is produced. Give it a try, you won't regret it!


Ask a question

Product Questions

Are there refills available for sale or do I need to purchase a entire kit when I run out?
Question by: david smith on Apr 5, 2016 7:21:00 AM
Great question! Unfortunately we do not carry refill kits for the Nyos test kits, however, some of our other brands of test kits do have refills available.
Answer by: Carter (Admin) on Apr 8, 2016 2:43:00 PM