API Freshwater Aquarium Master Test Kit, 800 count

Rated 4.5944 out of 5 stars
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$35.98Chewy Price
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About This Item

  • Specifically designed to measure, modify and balance the conditions of freshwater aquariums.
  • Measures freshwater pH, high range pH ammonia, nitrate and water hardness.
  • Includes 4 test tubes, a holding tray for testing bottles and a test tube rack.
  • Helps protect your finned friends from toxic water conditions.
  • Easy-to-follow instructions, simply compare your results to the color card.
Play Video: Learn More About API From Our Team of Experts
Learn More About API From Our Team of Experts

To help lower your aquarium's pH level check out API's pH Down. If you need to raise the pH level then API's pH Up water treatment is just what you need.
Test your aquarium's water with API's replacement test tubes.
Compatible with API's Filstar xP4 Filter.

About API Testing

Testing the Waters

For fish to thrive, their aquarium water must be similar to the water in their natural environment. Poor water quality can cause stress, illness and even the loss of your fish. Important water quality parameters include ammonia, nitrite, nitrate, and pH. These can vary over time, and they are invisible to the eye, which is why it is necessary to test weekly. Choose from a wide range of API testing options like the Freshwater Master Test Kit or 5-in-1 Test Strips to accurately evaluate your water.

Pressed for Time? Just Dip and Read

Simply dip an API test strip into your aquarium, swirl it twice, and then use the color-coded chart to determine if your water is within safe parameters or if adjustments are needed. That’s it! API test strips are available in a 5-in-1 version, which includes testing for pH, nitrite, nitrate, carbonate, and general hardness. Ammonia and pH test strips are also available so you can mix and match according to your needs.

The Scientific Approach

Get professional results from the comfort of your home with API test kits. Measure up to six parameters with API Master Test Kits, or pick and choose from a wide variety of individual test kits. Both types of kits come with test tubes and a laminated, calibrated color card. API test kits allow for numerous tests, making them an inexpensive way to help keep your aquarium water quality in check.

How to Correct Aquarium Water Parameters

Too Much Ammonia?

Ammonia is released into the water through gills, urine, uneaten food and more. API Ammo-Lock detoxifies it instantly.

Inappropriate pH Levels?

Fish require a specific pH level to thrive. Use API pH Down to lower freshwater aquarium water pH to the right level.

Too Much Nitrite?

Use API Quick Start to quickly consume nitrite and help maintain an active biological filter.

Nitrates Too High?

API Nitra-Zorb helps remove nitrate and other toxins that can be harmful to fish and lead to algae growth.

About API

The team at API has a passion for fish and understands the rewards and relaxation fishkeeping can bring. For almost 60 years, they have developed premium products with a focus on proven and effective results. API offers a range of testing kits, water conditioners and nutritionally superior fish foods. They are dedicated to making a better underwater world for the benefit of fish and those who keep them.

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Fish TypeTropical Freshwater, Cichlid, Goldfish, Betta, Bottom FeederTropical Freshwater, Betta, Cichlid, Goldfish, Marine FishTropical Freshwater, Marine FishTropical Freshwater, Marine Fish, Betta...Tropical Freshwater, Marine Invertebrate, Goldfish
Aquarium TypeFreshwaterFreshwater, SaltwaterFreshwater, SaltwaterFreshwater, SaltwaterFreshwater

Questions & Answers

18 Customer Questions

Does this kit give us what is needed to correct the problem it discovers or do we purchase that separately?
Answer by ChewyNov 04, 2018
This kit is specifically designed to measure, modify and balance the conditions of freshwater aquariums.

How many water tests can you get out of one kit?
Answer by ChewyJul 28, 2017
This kit includes 4 test tubes with snap-tight caps.

Will this test kit let me know if there is chlorine present? I'm a real noobie.
Answer by ChewySep 13, 2021
This test kit does not test for chlorine level. This kit measures the 4 most important levels in freshwater aquariums quickly and accurately, including pH, high range pH, ammonia, nitrite, and nitrate.

What's the difference between "fresh water pH", and "high range pH"?
Answer by ChewyJun 19, 2019
The pH Test will be able to read a pH level between 6.0 to 7.6. When keeping livebearers, goldfish, African Cichlids or marine fish & invertebrates, the High Range pH Test should be used. High Range pH Test will be able to read a pH level between 7.4 to 8.8.

ReviewsWrite a Review

Rated 4.5944 out of 5 stars
143 Reviews
Would recommend to a friend

143 Customer Reviews

Rated 5 out of 5 stars
By April on Sep 4, 2022

Super helpful

I love this test kit, It is compact and easy to store. A really good option for someone with multiple tanks for a fishkeeping hobby.

Rated 5 out of 5 stars
By KimR on Aug 23, 2022

Great product

Easy to use and will last longer than the strips so a better value for money. I just wish it came with a test for chlorine also

Rated 4 out of 5 stars
By Jess on Jul 16, 2022

Easy instructions!

The instructions are simple and quick! The only problem is it's a little difficult to get a perfectly accurate reading with the color chart. Also a little on the expensive side.

Rated 5 out of 5 stars
By Michelle on Jun 3, 2022

Would Recommend

Very organized product that provides extensive results with simple instructions and testing. I also enjoyed that it offered ways to correct things if something was wrong!

Rated 5 out of 5 stars
By Lauren on Feb 25, 2022

A must have for fish keepers

I have been in the aquarium hobby for more than a decade. If you are going to keep fish then you have to know the nitrogen cycle. It is the single most important thing. This test kit is a must have. It is the best thirtyish dollars you will ever spend. This test kit allows you to monitor your ammonia, nitrite, nitrate and pH levels. When setting up a tank you will need to test daily. Once the tank has been running for a while and the nitrogen cycle has happened in full you can test less frequently. Yes you can but the test strips to tell you everything this kit will do but the strips are much more expensive in the long run.

Rated 5 out of 5 stars
By MorningSrar on Jan 26, 2022

Great Testing Kit

It has everything I need to test my pond water. All in one convenient case.

Rated 5 out of 5 stars
By Linda on Jan 4, 2022

Testing tank water

I really like this kit I had one from 15 years ago I thought I might get a new one I trust them

Rated 5 out of 5 stars
By Ally on Nov 5, 2021

great testing kit

This testing kit is easy to use and comes with step-by-step instructions. Highly recommend for freshwater fishkeepers!

Rated 5 out of 5 stars
By grumpy48 on Sep 1, 2021

As advertised

Very nice kit. Gives you everything you need to get off and running. Easy to use. I only wish they could get the price down some so more people would use them and more fish would be protected.

Rated 5 out of 5 stars
By NikkiKitty on Sep 26, 2021

Happy fish

The kit is great. It's easy to use. The only suggestion I have is to include an eye dropper to make it easier to get the correct water level.