API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored
Original price was: $50.48.$35.29Current price is: $35.29.
Price: $50.48 - $35.29
(as of Mar 19, 2025 05:16:12 UTC – Details)
Most water problems are invisible to the eye. Quickly measure and modify the six aquarium levels that are most important to the health of your freshwater fish with the API FRESHWATER MASTER TEST KIT. To stay healthy and thrive, fish need properly balanced levels of ammonia, pH, high range pH, nitrite and nitrate. These levels can change rapidly and create harmful conditions when fish waste, uneaten food or other organic matter accumulate, or when untreated water is added. If left uncorrected, all of these can be harmful or even fatal to fish, with consequences such as reduction of oxygen, increase in stress and higher risk of disease. The API FRESHWATER MASTER TEST KIT measures these six parameters with scientific accuracy and provides professional results. It comes with four test tubes, a holding tray and computer calibrated, laminated color card. Just fill the test tubes, add the test drops and compare results to the color card. Then follow the recommendations on the card if action is required.
With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.
Is Discontinued By Manufacturer : No
Product Dimensions : 9.13 x 3.5 x 4.65 inches; 1.15 Pounds
Manufacturer recommended age : 1 month and up
Item model number : 34
Department : Unisex-Adult
Date First Available : June 20, 2004
Manufacturer : Mars Fishcare
ASIN : B000255NCI
Country of Origin : USA
Contains one (1) API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, including 7 bottles of testing solutions, 1 color card and 4 tubes with cap
Helps monitor water quality and prevent invisible water problems that can be harmful to fish and cause fish loss
Accurately monitors 5 most vital water parameters levels in freshwater aquariums: pH, high range pH, ammonia, nitrite, nitrate
Designed for use in freshwater aquariums only
Use for weekly monitoring and when water or fish problems appear
Customers say
Customers find this water testing kit a good value for the money. They find the instructions clear and easy to follow. The kit provides most of the testing options needed by aquarium owners, with a laminated card included to help measure results. The tests work well and are reliable. Customers appreciate the accuracy of the readings over test strips.
AI-generated from the text of customer reviews
10 reviews for API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored
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Original price was: $50.48.$35.29Current price is: $35.29.
Natalie –
Best test kit!
This is the best, most recommended water testing kit for aquariums. Every time I’ve talked with others who keep tanks, they always ask which test kit I use and happily agree this is the one to go with. It is a bit expensive if you’re just getting started but worth it, last a long time, is easy to use once you read the instructions, and has everything you need. It’s helpful to watch videos on water tests/changes if you’re just getting started and want to learn more before making the purchase. I recommend this kit!
Don Gray –
The best freshwater basic testing kit…
You will find this freshwater kit is far more accurate than test strips. The soaking of a tiny doped pad method of test strips just isnt an accurate way to test. This is the industry standard water test kit that most aquarists swear by.
1st, be sure the test chemicals you get are not near expiration. You should easily be able to use this kit for up to a few years before the chemicals included lose their effectiveness. The expiration date is on the kit box and on each bottle of solution.
The glass test tubes that used to be included in this kit have been replaced by plastic ones. The glass tubes made cleaning up a breeze and were far better than the plastic ones that don’t clean up as well. Also the 5ml fill line is a bit difficult to see on the plastic tubes. It was always inevitable though that you would eventually break a few glass tubes before you got through the 800 tests this kit can provide. They now just assume that by the time the plastic tubes get permanently stained, you’ll be on to a new test kit with new tubes. While not a deal breaker, I prefered the glass tubes.
Be sure you purchase the kit best suited for the tanks or ponds you keep. This kit is the freshwater version.
This kit tests pH in two different ways. If you have ph generally higher than 7.4 you use the high pH test solution. If you have pH below 7.6 youll use the standard pH test kit. This is great of you are keeping multiple tanks with different pH levels or if your one tank tends to bounce around between 7.4 to 7.6. Once you figure out which test best suits your aquariums, youll likely not use the other solution.
This kit tests for total ammonia using 2 solutions in one test. Ammonia is a very hazardous chemical to your fish and plants. Use this kit to keep these levels of ammonia at or near 0.
This kit tests Nitrites using 1 solution. This is the second step in the nitrogen cycle. While not as harmful as ammonia, it’s still something you should strive to get as close to 0 as possible. Now some people using heavily planted and fertilized tanks will actually strive to have this level low but present.
This kit tests for nitrates in two solutions for 1 test. While nitrates are not as harmful to fish as Ammonia or Nitrite, most fish keepers still strive for low readings. Long term exposures to high nitrates can still cause harm to fish. Generally youll get rid of nitrates by water changes or heavy plant growth. Many people with heavily planted and fertilized tanks prefer this value to be a little higher to feed the plants but still low to protect the fish.
With this test kit testing 4 of your most important chemicals in fresh water, it is a necessity to have on hand. Test strips might be more convenient but are seldom very accurate. This liquid master test kit is the standard if you want true values at an affordable price. It comes in several varieties, depending on whether you have freshwater, marine, reef or ponds. Its a great way to see what is going on in your setup before any loss of life occurs.
Geomancer –
A must have for any freshwater aquarium
They don’t call it the “Master Test Kit” for nothing.
If you keep freshwater fish, you will need this test kit. It contains all the must know tests to ensure your water quality is up to par for your tropical fish. The importance of a kit like this really shines while you are cycling a tank and it’s critical you know how the cycle is progressing. A liquid test kit like this one is far more accurate than using strips, and is cheaper in the long run.
A brand new aquarium will experience what is called a cycle. Fish produce waste in the form of Ammonia, which is pretty toxic to the fish and has long term health effects, and possibly death. Bacteria that naturally exists everywhere in the air will enter the tank and feed off the ammonia. The bacteria produce Nitrite as a waste and unfortunately this is even more toxic to fish than the original ammonia was. However, again, there is a natural bacteria in the air that will enter the tank and consume the Nitrite, and in the process produce Nitrate (with an a). Nitrate, again, is toxic to fish but they can tolerate it far better than ammonia or nitrite.
A tank is fully cycled when both Ammonia and Nitrite (with an i) are 0 ppm and you have some reading of Nitrate (with an a).
And this is why this test kit comes in handy, it contains tests for Ammonia, Nitrite, Nitrate, pH, and high range pH. You’ll likely only use one or the other for pH depending on what your tap water is (acidic or basic).
All of the tests are easy to perform, and the kit comes with 4 test tubes allowing you to perform all of the needed tests at once. A word of caution, follow the directions closely for the Nitrate test, it requires you to shake the #2 reagent bottle for a period of time. This is essential for an accurate reading.
CAUTION: If you use a water conditioner that will also detoxify ammonia (for example Seachem Prime), this test kit will still show an Ammonia reading. This is because the conditioner converts the Ammonia to Ammonium, a chemical that still contains the Ammonia but in a non-toxic form to fish.
SlimChiLion –
Great Product
Iâve used the master kits for years. Itâs nicely packaged which is convenient. Testing is accurate as always. I highly recommend this product if youâll be testing your water.
Noah Schreiber –
Not a masters test kit but works great!
My only complaint with this test kit is the phrase “Masters Test Kit” very much implies it has everything you need for fresh water tanks. The problem with that is that it is missing kh and gh tests. Those are very important if you want to own invertebrates in a tank and even outside of invertebrates there are times you would want to test it as well to make sure the tank is relatively balanced.
With that said it is the only test kit I use even though I buy my kh and gh test kits separately in the times I do need to test it and the reason being is the test kit is very accurate for testing the water. Normal test kits like the ones that use strips are nowhere near as precise as this test kit so it makes up for the previously stated flaws.
If you plan to keep invertebrates in your tank you can buy the necessary chemical tests separately and other than that this is a great beginner test kit for aquarium enthusiast. Thanks!
Sarah86 –
So much better than the dip strips .
Cityus –
Great little kit has everything I needed.
Amazon Customer –
Compare con producto de 3mil y da el mismo resultado trae todo fácil de hacer y explicado y me funciona muy bien para mis peces payaso
David P. –
El kit es bastante completo, es muy fácil de usar, super recomendado.
Marco A. –
Excelente producto y fácil de usar, buenos resultados