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API Saltwater Master Test Kit

by API
271 customer reviews
| 16 answered questions

List Price: $31.49
Price: $21.62 & FREE Shipping on orders over $35. Details
You Save: $9.87 (31%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
64 OUNCES
  • Over 550 tests
  • Kit includes laminated color card, 4 test tubes and holding tray
  • Includes instruction booklet on how to correct unsafe water conditions
34 new from $14.37
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.


Marineland Starter Kit
$21.62 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

API Saltwater Master Test Kit + Salinity Refractometer, Aquarium & Seawater - Dual Scale (1.0 to 1.070 S.G.) by Agriculture Solutions + HDE LCD Digital Fish Tank Aquarium Thermometer
Price for all three: $55.52

Buy the selected items together

Product Description

Size:64 OUNCES

A complete kit for testing saltwater & reef aquariums.Test include:high range pH, ammonia,nitrite,nitrate,4 test tubes, tray & rack.Tests water 4 ways to protect marine fish from dangerous water conditions.


Product Details

Size: 64 OUNCES
  • Product Dimensions: 7 x 5.8 x 4.8 inches ; 4.2 ounces
  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B001EUE808
  • Item model number: 401M
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (271 customer reviews)
  • Amazon Best Sellers Rank: #1,334 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.

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From the Manufacturer


API Saltwater Master Test Kit

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 Saltwater Master Test Kit

by API

Features and Benefits

Maintaining good water quality is the key to successful fishkeeping. The API Saltwater Master Test Kit is a complete kit for testing saltwater aquariums to protect marine fish and invertebrates from unsafe water conditions. The Saltwater Master Test Kit tests 4 key salt water parameters. The kit is highly accurate and economical, and includes 6 bottles of liquid test reagent, a computer-calibrated, laminated color card, 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 High Range pH, Ammonia, Nitrite, & Nitrate
  • Includes all tests required to test the nitrogen cycle
  • Fast, easy, and accurate for precise test results
  • Economical – Conducts 550+ tests

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 Calcium Test Kit

Monitor Calcium for healthy reef inhabitants

Measures Calcium levels as low as 20 mg/L

For use in reef aquariums

API Phosphate Test Kit

Tests Phosphate levels from 0 to 10 ppm

For 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


Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

37 of 46 people found the following review helpful By AMiller on January 2, 2012
Size: 64 OUNCES Verified Purchase
I received my test kit in a timely manner only to find out that the solutions were outdated. For those that don't know on the API test kits each bottle has a lot number, the last 4 numbers correspond to the date of which they were bottled, so if the last four digits read 0607 then the solution was bottled on June of 2007. API says that their solutions are good for 3 years, I always change my kits out every year (better to be safe than sorry). My suggestion would be to not purchase these kinds of kits over the internet unless you know for sure that they are not outdated.
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10 of 11 people found the following review helpful By Jeannette Starr on March 22, 2012
Size: 64 OUNCES Verified Purchase
Fast ship and great price; much better pricing than a store has to offer

Expiration dates are perfect!!! not sure why some have complained about exp dates already expired, so they must have resolved that issue. My exp dates are 2016 and 2017, so great product on my end.

would recommend you buy a test tube holder. The case will work but it is easier to use if you have an actual holder. they sell them on amazon.
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5 of 5 people found the following review helpful By Lee W. on April 7, 2014
Size: 64 OUNCES Verified Purchase
I test my water and everytime I see the colors and get scared. Then I look at the chart and see my colors are good. The test kit tells me everything is ok and I am not losing any stock to water issues so I think its fair to say everything is good. PH colors are sometimes hard to figure out exactly but I'm more concerned with the Ammonia, Nitrate & Nitrite.
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6 of 7 people found the following review helpful By David McDonald on April 8, 2014
Size: 64 OUNCES Verified Purchase
I have heard good and bad about the API test kits, especially when it comes to testing saltwater. I have to be honest and say that this kit has been very accurate and extremely easy to use. Would recommend it to anyone who is in or getting into Reefing.
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6 of 7 people found the following review helpful By Hunter Pro on March 6, 2010
Size: 64 OUNCES
Purchased this test kit from Petsmart...It has been very accurate with each test we do..It comes with everything you need including color charts and test tubes..I believe you get over 500 tests with it...
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7 of 9 people found the following review helpful By Mike VINE VOICE on May 10, 2010
Size: 64 OUNCES
The test kit is very easy to use. The instructions are easy to follow. The only thing that you have to watch is when you are mixing the chemicals and the water in the test tube. If you leave the test tube upside down for a period of time, it will start leaking. If you do it quickly, there are no issues what-so-ever. The tests are accurate. I've used these tests when I initially set up my tanks and before I perform maintenance (change the water). I use this tester for both my reef tank and my seahorse tank. Shop around though. As the other reviewer said, some pet stores have this priced at $40. I've seen them as high as $45.
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2 of 2 people found the following review helpful By BBestvin on January 5, 2015
Size: 64 OUNCES Verified Purchase
Great price, great kit, no real complaints. I recently started up a saltwater tank and was curious as to whether or not I would need a separate Test Kit because of the different tank type. After scouring the internet, I couldn't find a really great response, so I went ahead and purchased this test kit for my Biocube tank. It works exactly as expected. However, I did find out later that the API kits for freshwater and saltwater actually contain the same chemicals for testing, the only thing that varies slightly are what the colors mean. In summary, the color cards are the only difference. So...if you have a freshwater kit already, there's really no need to purchase this kit...just find a scan of the color card online. However, for what it's advertised to do, this kit works great...and...it's WAY cheaper than you could find it for in a retail store :)

I actually made a video comparing the freshwater and saltwater test kits to show the differences.

https://www.youtube.com/watch?v=fE77Q8tTTRw&list=UUb18W_ytoNRxi58NmT325Ug
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4 of 5 people found the following review helpful By Anna Martha on April 7, 2013
Size: 64 OUNCES Verified Purchase
I have heard that these API kits are somehow substandard, but it works great for me. First, I was a chemistry major in college so maybe that makes a difference, but I don't see how it would. As long as you can fill the test tubes to the mark with aquarium water and follow the instructions for adding X number of drops, shaking, and then adding X number of other drops, it works perfectly. The test tube caps don't fit well so expect to get chemicals on your hands and you don't want to get those in your aquarium so be careful. Also, it is worth it to buy a 10 mL glass pipette and a 10 mL pipette pump to get water and fill these tubes. I also use mine to target feed various fish and corals - much better than a turkey baster method.
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API Saltwater Master Test Kit
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