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  • API Reef Master Test Kit
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API Reef Master Test Kit

by API

List Price: $35.49
Price: $26.15 & FREE Shipping on orders over $35. Details
You Save: $9.34 (26%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
  • Includes all tests required to test the nitrogen cycle
  • Kit includes laminated color card, 4 test tubes and holding tray
  • Includes instruction booklet on how to correct unsafe water conditions
33 new from $20.37
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 Reef Master Test Kit + API Saltwater Master Test Kit + Salinity Refractometer, Aquarium & Seawater - Dual Scale (1.0 to 1.070 S.G.) by Agriculture Solutions
Price for all three: $81.11

These items are shipped from and sold by different sellers.

Buy the selected items together



Product Details

  • Product Dimensions: 7 x 5.8 x 4.8 inches ; 1.1 pounds
  • Shipping Weight: 1.6 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B001D6Z7QW
  • Item model number: 402M
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (54 customer reviews)
  • Amazon Best Sellers Rank: #4,611 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 Reef Master Test Kit

by API

The REEF MASTER TEST KIT tests 4 key parameters to keep reef inhabitants healthy. The kit is highly accurate and economical, and includes 7 bottles of liquid test reagent, 2 computer-calibrated, laminated color cards, 4 glass test tubes with snap-tight caps, holding tray, as well as complete, step-by-step instruction booklet, including information on how to correct unsafe water conditions.

  • Tests Calcium, Carbonate Hardness (KH), Phosphate, and Nitrate
  • Fast, easy, and accurate for precise test results
  • 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.

Other Recommendations

API High Range pH Test Kit

Monitor aquariums with high pH ranges

Reads pH levels from 7.4 to 8.8

Use in both fresh & salt water

API Algaefix Marine

Use weekly to control algal growth and reduce aquarium maintenance

Does not discolor water or cause foaming

Will not harm Reef inhabitants

EPA Registered

API Copper Test Kit

Tests Copper levels from 0 to 4 ppm

Measures both free and chelated copper

For use in both fresh & salt water



Customer Questions & Answers

Customer Reviews

Very easy to use the tests.
John Webb
I got both the Reef Master & Saltwater Kits, they work great for testing my water.
Linda Hankins
After many attempts to contact them again I get no response from them.
L. Reed

Most Helpful Customer Reviews

13 of 14 people found the following review helpful By R. Garth VINE VOICE on November 14, 2011
Verified Purchase
I have used Salifert, Elos, Redsea and a bunch of others. While it's really hard to guage the accuracy of all these kits, one can assume at least +/- 10% readings. With the API kit I see small enough changes reflected in the readings to give me confidence that it's within the ball Park of ELOS and Salifert, so at a the current price API is a clear winner. I also like that these tests are simpler to preform than most of the others, so thats a real plus.
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9 of 9 people found the following review helpful By Patrick on November 24, 2010
Verified Purchase
When combined with the Saltwater Master Test Kit, these kits provide all the tests that a beginning reef master could want. I am using these tests in a 40 gallon breeder reef tank, and so far they have been easy to use and reliable. The only complaint I have is that they are sometimes hard to read on certain tests. It is hard to decipher the different levels from one another if they are close.

Still, I would definitely recommend this kit to anyone that has a reef tank.
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2 of 2 people found the following review helpful By ron pullins on July 4, 2013
Verified Purchase
Would be an excellent kit. However, mine did not come with color charts. Called API. Supposed to get in mail. Also, this kit is needed in conjunction with saltwater test kit. Wish it was one complete set.
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2 of 2 people found the following review helpful By Daniel on May 24, 2013
Verified Purchase
Has all the supplies you need and a case to keep it all in. I wish it had a quick instruction sheet for all the tests. The instruction book is very detailed and the testing is accurate. Highly recommend for testing your reef tank. A must have.
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1 of 1 people found the following review helpful By Amazon Customer on January 8, 2014
Verified Purchase
The Reef Master Kit doesn't include Magnesium tests, for this reason I believe 'Master Test Kit' is a bit falsly advertised. Otherwise great price, must have.
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1 of 1 people found the following review helpful By Amy Novak on November 5, 2013
Verified Purchase
The results are spot on. I actually took some water to my LFS to compare and they had the same results. The instructions are easy to read an offer some simple instructions on how to fix any issues that might arise. The Kit is solid, the only negative is that one of my test tubes leaked a little but nothing major. When combined with other test kits you'll be able to have great water quality.
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4 of 6 people found the following review helpful By David Baltazar on June 10, 2013
Verified Purchase
Simply put having a test kit is essential for any reef aquarium keeper. I only have a 28-gallon tall aquarium with just soft corals, a feather duster, a few damsels & a couple of cleaner shrimp. The API Reef Master Kit is well packaged and everything is labeled very clearly. I sometimes have difficulty interpreting the nitrate and phosphate tests as the results are limited to viewing color code charts of different shades of green and orange. For example when I conduct the test for nitrates, my resulting shade of green from my test tube is in the range of .50 to 1.0 as my best guess instead of .50 or 1.0.

The instructions are very well written and easy to follow although I can't help, but notice API's intentional attempt at product placement by their brand. For example if your test kit yields a high result for phosphates, the instructions recommends that you purchase & use API's Phos-Zorb to help reduce phosphates in addition to conducting water changes & removing waste. If you have low calcium levels you can use API's Eco Calcium Marine to increase calcium levels. If your nitrates are high you can use API Tap Water Filter to help reduce nitrates in addition to water changes & the removal of waste.

Some other reviewers have complained about the absence of the ammonia test, but I have already owned API's ammonia test kit (with its different shades of yellow test results chart) that I used when I initially cycled my aquarium, so adding the reef master kit just supplemented to what I already have. Didn't need the instructions help to buy another API product for ammonia testing because I already did.

Overall an adequate test kit for the very important task of truly knowing what's in your aquarium water (or at least ballpark figure ranges) to help your corals, fish & invertebrates thrive successfully.
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By Jeremy F. on July 11, 2014
Verified Purchase
Always good quality kit
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