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API Saltwater Master Test Kit

4.5 out of 5 stars 350 customer reviews
| 25 answered questions

Price: $31.49 & FREE Shipping on orders over $49. Details
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
19 new from $16.45
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.


Marineland Starter Kit
$31.49 & FREE Shipping on orders over $49. 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
  • +
  • API Reef Master Test Kit
Total price: $75.76
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 (350 customer reviews)
  • Amazon Best Sellers Rank: #5,213 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: 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I received my test kit in a timely manner only to find out that the solutions were outdated.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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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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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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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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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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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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Size: 64 OUNCES Verified Purchase
Don't pay more than $20 for this kit. You'll only use it for checking to see if the tank is cycled. Most local fish stores will run these same tests for you cheap or free.

I found the PH test hard to read and had to buy a PH probe sooner than I planned.

The only test from this kit I use on an occasional basis for my established tank is the nitrate test.

Their Reef Master test kit is pretty useless also. There's no low range phosphate test, so your tank will be overrun with algae long before it registers on the test.
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Size: 64 OUNCES Verified Purchase
This product works exactly as described. As a marine hobbyist, I highly recommend a digital pH meter, but this works when I'm not in a rush and want to get relatively accurate tank parameters. It has kept my tank stable for quite some time now and I have zero complaints with the usability of the product as a whole. It's pretty easy, just read the directions, follow them to a T, and you should have pretty accurate results every time. I've read that people have issues matching the vile color to the color charts, but I don't have any issues with that, generally the colors are pretty spot on or are between two different colors. The bottom line is that if you're hitting unsafe parameters anyway, the exact color match isn't going to help you either way-- too high is too high regardless of an exact match in color. Any time my levels get anywhere near where they aren't supposed to be, I immediately treat my tank as needed (water change, etc), which is what all hobbyist should be doing anyway.
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