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API Freshwater Master Test Kit

4.6 out of 5 stars 1,337 customer reviews
| 70 answered questions

List Price: $28.99
Price: $27.19 & FREE Shipping on orders over $49. Details
You Save: $1.80 (6%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
20z
  • Over 800 tests
  • Kit includes laminated color card, 4 test tubes and holding tray
  • Includes instruction booklet on how to correct unsafe water conditions
38 new from $15.30 1 used from $25.00
Special Shipping Information: This product may not be available for 1 or 2 day shipping due to federal regulations that require it to ship via ground ship methods only. This product can only be shipped within the 48 contiguous states.


Marineland Starter Kit
$27.19 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

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Size: 20z
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Product Description

Size: 20z

Freshwater Master Test Kit is a complete kit for testing aquarium water.Tests water 6 different ways to protect tropical fish from dangerous water conditions.Tests include: freshwater pH, ammonia, nitrite, high range pH, and nitrate, 4 test tubes, tray.

Product Details

Size: 20z
  • Product Dimensions: 9.1 x 3.5 x 4.6 inches ; 1.2 pounds
  • Shipping Weight: 1.2 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B000255NCI
  • Item model number: 34
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (1,337 customer reviews)
  • Amazon Best Sellers Rank: #500 in Pet Supplies (See Top 100 in Pet Supplies)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

From the Manufacturer


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Size: 20z Verified Purchase
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.
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Size: 20z Verified Purchase
Four of five tests are fairly straightforward. The ammonia test, however, requires mixing the 5ml of tank water with 10 drops of one solution, shaking a second solution bottle for 30 seconds, adding 10 drops from it, then shaking the test tube for one minute, and then waiting 5 minutes to test color against a chart. Seems a bit much, no? That being said, this process isn't any more difficult than any other system I've seen, and it seems to be accurate. The color chart is waterproof, though the instruction manual isn't, and due to the moist nature of its application, make sure to memorize instructions quickly. API is by far the most highly recommended test kit on every freshwater tank forum I've read, and I found it here a good bit cheaper than at my local (chain) pet store. Be aware that the test tubes are glass and will occasionally shatter when trying to juggle all 4 at once, but I've only once needed to test for everything - the first day the kit came in. Nitrates are probably the only regular (weekly) test you'll have to do outside of changes to the tank, such as adding fish or changing substrate or filter media.

FYI each bottle has a printed "Lot Number" on the back, the last four digits of which are the month and year of manufacture. Anything over three years or so is getting old, and you'll probably want an exchange unless you test with great frequency. These chems definitely have a finite shelf life.

Oh, and anyone who has live plants in a tank will want phosphates and KH test kits as well.
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Size: 20z
I recently started up a freshwater tank and am learning the ropes as I go. I was doing some research on what to expect and what supplies I needed. I came across this product in a search and after reading other product reviews I decided to splurge and get this test kit. I think out of all the ones I reveiwed this is the only one that had all the 4 major tests in one case with ease of use that even a child can do (with supervision).

I do have an added tip for all you PetSmart/PetCo shopppers. Print out this page and take it in and they will price match. The PetSmart (instore) price is $29.99 and after showing them the ad I saved over $13, and I didn't even have to pay for shipping! :) GREAT DEAL!!!
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Size: 20z
This is a good all-purpose test kit for someone beginning freshwater fish-keeping. It's also the most economical way I've found to purchase a wide variety of tests (it contains test solutions for pH, ammonia, nitrites, and nitrates) in large volume. The directions are clear and concise and the color coded cards make readings easy.
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Size: 20z Verified Purchase
This a very nice test kit for testing Ammonia, Nitrite, Nitrate, and pH. Easy to follow instructions. The bottles are marked with the test they are for and how many drops are to be used. Test tubes are easy to fill, marked with proper water level, and the lids fit nicely. Easy to read color sheet for determining test results. Test instructions are easy to read and follow. Instruction book also includes a log to record results (good for one aquarium only unless you use a different page for each one).

Highly recommended.

Oct. 28, 2012:

This test kit has been very useful. I am very happy with the test kit. It is easy to use and has helped my greatly in keeping my aquarium water correct.
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Size: 20z Verified Purchase
There are a few excellent points about this test kit:

1) buying here saves you about 50% from the retail pet store
2) you get 800+ tests for ~ $17 vs. 25 tests w/ strips
3) results are far more accurate with liquid test kits like this one when compared to dipsticks

Note that of the 5 tests you can do with this, three of them require 5 minute waits before you read the colors, so it's not as fast as a dipstick. But honestly, this is such an economic choice, and it's accuracy far exceeds quick strips that it's ridiculous to buy them. Get this kit!
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