5 in 1 Aquarium Test Strips - 25 Strips

SKU: 216507
Manufacturer: API
MPN: 33G

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API 5 in 1 Test Strips are the easy and quick way to monitor your water quality. Each strip tests for pH, Nitrite, Nitrate, General Hardness and Carbonate Hardness all at once and gives fast and accurate results.

For more information download the 5 in 1 Aquarium Test Strips Water Test Results Chart.


Internal Id



1. Dip strip directly into aquarium.
2. Swirl two times.
3. Remove with pads face up.
5. Compare to color chart.
6. Immediately ready GH and KH.
7. Wait 30 seconds, then read pH, NO2 & NO3.

Ratings & Reviews

4 reviews

  • 4 stars
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  • 1 star
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Good product


A great way to do a quick check on your basic chemicals status in your reef tank; warning of nitrite and nitrates.

good but...


These strips DO work as advertised. Although, even though I am an experienced fish tank owner for over 13 years and have 2 65-gallon tanks, I'm still perturbed what I am supposed to do when CO2 is off.
Anyway, my major disappointment with this product is the PACKAGING! You hate a HUGE box, inside which there is a BIG cyllinder, inside which is mostly emply space and just tiny little wittle strips. Yes, I know, it's supposed to be only 25 strips. But did you have to give it such a huge packaging?
In addition, I found the PH levels in orange-spectrum colors instead of the usual yellow-to-blue spectrum, which is made it difficult to read.
Summary: inflated packaging, tiny hard-to-read test strips with confusing colors, inflated price. You'll do much better with a standard liquid testing. Hence, my rating is only 2 stars.

GREAT fast check for basic quality


This is just a maintenance tool to get a FAST, general picture of your tank's health. If you suspect a problem, use additional and more specific tests.

If you have multiple tanks (I have 8), you can test the water condition in about 5 minutes. If you have more than one tank, get a few packages. Ken's prices are the best.

Low cost way to maintain an aquarium.


I was very happy with the instructions and the ease of use. These test strips work very well and are easy to read. I was shocked to see nitrates at 200! Explains why our fish kept dying. Can't wait to get our water ready so we can buy some more fish.