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  • API Freshwater Master Test Kit
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API Freshwater Master Test Kit

by API
| 23 answered questions

List Price: $28.99
Price: $24.99 & FREE Shipping on orders over $35. Details
You Save: $4.00 (14%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
2 oz.
  • Over 800 tests
  • Kit includes laminated color card, 4 test tubes and holding tray
  • Includes instruction booklet on how to correct unsafe water conditions
41 new from $15.45
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.


Frequently Bought Together

API Freshwater Master Test Kit + Seachem Prime 500ml
Price for both: $36.65

Buy the selected items together



Product Details

Size: 2 oz.
  • Product Dimensions: 9.1 x 3.5 x 4.6 inches ; 1.2 pounds
  • Shipping Weight: 1.2 pounds (View shipping rates and policies)
  • Shipping: Currently, item can be shipped only within the U.S.
  • ASIN: B000255NCI
  • Item model number: 34
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (655 customer reviews)
  • Amazon Best Sellers Rank: #240 in Pet Supplies (See Top 100 in Pet Supplies)
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Product Description


API has been an aquatics industry leader for over 40 years, and we are committed to developing the best products and solutions to simplify the care of aquariums and ponds.

API Freshwater Master Test Kit

by API

Taking a few minutes each week to maintain and monitor aquarium conditions is the key to a healthy aquarium. The FRESHWATER MASTER TEST KIT tests the parameters that affect the health of freshwater fish: pH, High Range pH, Ammonia, Nitrite and Nitrate. The FRESHWATER MASTER TEST KIT is highly accurate and economical, and includes a computer calibrated, laminated color card, 4 test tubes and holding tray. The FRESHWATER MASTER TEST KIT comes with a complete, step-by-step instruction booklet, including information on how to correct unsafe water conditions.

  • Tests pH, High Range pH, Ammonia, Nitrite & Nitrate
  • Includes all tests required to test the nitrogen cycle
  • Fast, easy and accurate
  • Economical - conducts 800+ tests
  • Compact to store at home

API Makes it Simpler

Follow the API EASY CARE GUIDE steps to simplify aquarium care.

Regular testing of key water parameters is an essential part of routine aquarium maintenance. Levels should be tested weekly to make sure they do not reach undesirable levels, as well as when a problem appears.

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Works instantly



Customer Questions & Answers

Customer Reviews

Very easy to use with clear instructions.
matt1234
Works great, has a good variety of tests, has a lot of vials and bottles so it will last you a long time.
SuYuanHao
I highly recommend this kit for anyone who needs to test their fish water.
jschristian44

Most Helpful Customer Reviews

134 of 141 people found the following review helpful By Kevin on October 6, 2010
Size Name: 2 oz. 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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140 of 150 people found the following review helpful By C. Akin on April 3, 2007
Size Name: 2 oz.
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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72 of 77 people found the following review helpful By S. B. Guza on February 15, 2005
Size Name: 2 oz.
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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27 of 27 people found the following review helpful By Geomancer on January 31, 2012
Size Name: 2 oz. 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.
Read more ›
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26 of 28 people found the following review helpful By J. Medley on October 18, 2009
Size Name: 2 oz. 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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14 of 15 people found the following review helpful By Amazon Customer on February 7, 2010
Size Name: 2 oz.
This test kit is the best on the market. Instructions are well explained and also teach in detail why this step is so important. The more you perform the test the quicker it goes, and before you know it, it becomes like second nature.
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