API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored
Original price was: $50.48.$35.98Current price is: $35.98.
Price: $50.48 - $35.98
(as of Oct 30, 2025 20:50:10 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
Best Sellers Rank: #1,710 in Pet Supplies (See Top 100 in Pet Supplies) #2 in Aquarium Test Kits
Customer Reviews: 4.7 4.7 out of 5 stars 38,981 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
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 easy to use and appreciate its quality, noting it’s better than paper strips. The kit is accurate and comprehensive, covering all important freshwater parameters, and works well even for large ponds. They consider it essential for freshwater tanks and consider it good value for money.
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.$35.98Current price is: $35.98.
H. Lincoln –
A fish lovers must!
This test kit has been a game changer for my freshwater tank. It includes everything I need to monitor ammonia, nitrite, nitrate, and pH levels. The instructions are clear and the color chart is easy to read, even for beginners. It works well and will keep your fish safe for any size tank :)I test weekly, and this kit has helped me stay ahead of any water quality issues. Itâs lasted a long time and the case keeps everything organized. If youâre serious about fishkeeping, this kit is an absolute must. Although it can get pricey, itâs extremely worth the value!
Peter Suslock –
A Must Have Test Kit For Every Level Of Hobbyist
API is a giant among companies that provide aquarium related products.They have maintained their sound reputation by offering innovative products and resisting the temptation to tamper with those which are already established and are time proven, dependable performers.The Fresh Water Master Test Kit belongs in the arsenal of tank maintenance and care products for every level of hobbyist from beginner to advanced.It’s important to understand that these kits provide an indication only – it’s unrealistic to expect a pin point reading as the tests aren’t intended nor made to deliver that. But rather, to enable you to get a decent reading of say, where your PH level is knowing the accuracy may be off a few points sure beats shelling out $200 for a good digital PH meter.It’s critical to understand these limitations and that they apply to everyone of the four included tests.PHHigh Range PHAmmoniaNitritesNitratesFor must of us, Ammonia is the most important because it’s the number one killer of aquarium kept fish. The others are important of course, but Ammonia levels should always be checked and checked often. It’s also important to pay attention to the expiration dates of the liquid reagents. Expired reagents mean off the charts inaccurate readings. Along with the liquid reagents the kit includes, instructions both in a small manual and attached to each bottle of testing liquid, four test tube, four plastic caps and a color chart.To ensure you get the most accurate reading possible compare the finished result to the card color block in the best possible light and against the most pure white background you can find. Just like computer monitors many of us see color differently which is the inherent draw back of this type of testing. But again, there is nothing else on the market at this kind of price point which can give you enough information to correct and adjust your key water parameters.If you’re just starting out in this wonderful hobby, you’ll master using this kit in no time and it will help you maintain a healthy and flourishing aquarium. Remember to never, ever rinse even cleaned test tubes in your tank water – even very small traces of testing reagents can be lethal to your fish.Draw water from your tank using a large plastic syringe available at any drug store, super market, or add one to cart from Amazon.For a full range of tests that cover the four most significant parameters you need to stay on top of – you can’t beat the API Master test kits, not at this price. You can also buy replacement API test tubes which are sold in boxes of a dozen or 24 at a reasonable price, and a steal at Amazon.
Photoman –
Great value
Better than strips
mac –
accurate and easy to use, but buy with syringe/pipette
easy to use and accurate. it’s a bit expensive up front, but i’d say it’s cheaper and more valuable in the long run because of the accuracy and amount of uses compared to disposable strips. the only comment/recommendation i have is to also buy a pipette or syringe with this to fill the 5 mL tubes for accuracy and convenience. i’d say this is a must have if you value your aquarium’s well being
Hayley –
Easier than high school chemistry, but similar lab rules apply
Have you passed high school chemistry? (And by pass, I mean be able to follow the rules while in a lab?) Then great! You’ll have no problem using this test kit! However, be aware the instructions are like stupid tiny. I’m only 20 and even with reading glasses on top of my regular glasses these instructions are tiny. API offers a .pdf version of the instructions on their website, so I recommend those more than the little booklet. I also recommend one of those little syringes for like pet medication or human medication. It makes getting the water in the tubes a lot easier and with good accuracy.A lot of reviews mention the test tube caps not being tight when capped. I haven’t had this problem, but also when I invert the tubes, I hold my finger on the cap and at the bottom of the test tube. This was a habit I picked up in college chemistry because sometimes it better to be safe than sorry. Gloves aren’t necessary, but if you feel safer (especially since some of the chemicals are corrosive) then ball out with gloves! A lot of reviews also mention the nitrate test. I’m not a biologist, so I can’t say the accuracy, however, make sure you read the instructions REALLY good as it’s completely different than the others. You add 10 drops of solution bottle 1, shake the tube, shake solution bottle 2 for 30 seconds, add 10 drops, shake the tube for a minute, then wait the 5 minutes to develop.My few complaints is why I’m giving this a 4/5 stars because I feel like they really hinder the product. There’s simply not an appropriate number of tubes. There’s 5 tests, but only 4 tubes. Beyond that, they should really have 6 tubes since accidents are super prone to happen with tiny test tubes like this. Even beyond this, I feel a silicone or even plastic caps that screw with a rubber seal would be icing on the cake to eliminate the leaking and hardening issue. I’m also not buying API’s 24 kit of tubes for a few extra tubes, that’s just ridiculous. My next complaint is I believe they should add the GH and KH test in with this kit. pH, GH, and KH are usually all related to each other, so having that in the kit rather than paying $10 separately for it. I’d rather get it with the kit and pay 5-7 dollars more for the kit. To feed off some other reviews, adding the syringe like I mentioned would be better too since a lot of people probably won’t think about it. Finally, I think a chlorine test would be great since it’s toxic to most fish.However, I do believe in giving credit where credit is due and this kit is affordable which is great for those just starting to get into the hobby! I think the hobby is gate-kept by super expensive products, so having something like this that isn’t $50+ is really helpful for those just starting out! I also love the size of this kit, it’s easy to store. No test kit will probably ever be 100% accurate nor will they probably ever match up, but I feel this is good for America’s market. I say that because I’ve used Sera, which is imported from Germany, and it’s super nice with detailed and intense instructions which makes the tests feel a bit more accurate than this high school chemistry project. (Sorry API). However, the $80 keeps me from repurchasing and instead, buy this one. So, I guess that’s the magic of capitalism and having other bills to pay rather than spending $80+ on a water testing kit. Even after being in the hobby since I was in middle school, I feel a lot of the prices in this hobby prevent people from advancing further and wanting to get into saltwater, reefs, or ponds. I stick with freshwater simply because it’s the cheapest and easiest.Overall, recommend. 7/10, just be aware and take some of the recommendations some reviewers have already said and it should be smooth sailing.
blandina –
Value for money.
Rashid Iqbal Bhatti –
Very helpful for reef hobbyist
Adii –
Product arrived well before the Estimated time frame, Happy with the product. Good, Fast, Reliable Service.
KUMAR –
Worth the money spent on it.
Arshad –
A must for aquarium and biofloc maintenance. Please mind that this kit is salt water or high ph kit, hence you will receive only high ph testing reagent. If you require low ph testing reagent, then go for fresh water testing kit.Although high range ph testing provide you with results from 7 and higher ph, which is enough to serve the purpose of aquarium and biofloc (since 7-8 ph is necessary to maintain).Overall good product.