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API pH TEST & ADJUSTER KIT 250-Test Freshwater Aquarium Water pH Test and Adjuster Kit (29A)

4.6 4.6 out of 5 stars 774 ratings

To see product details, add this item to your cart. You can always remove it later.
pH & Adjuster

Purchase options and add-ons

  • Contains one (1) API pH TEST & ADJUSTER KIT 250-Test Freshwater Aquarium Water pH Test and Adjuster Kit, including 1 bottle of testing solution, 2 bottles of pH adjuster, 1 color card and 1 test tube with cap
  • Helps monitor and adjust pH and prevent invisible water problems that can be harmful to fish
  • Reads pH 6.0 - 7.6 and includes API pH UP and pH DOWN to adjust to proper level
  • Designed for use in freshwater aquariums only
  • Use for weekly monitoring and when water or fish problems appear

Customer ratings by feature

Easy to use
4.6 4.6
Easy to read
4.5 4.5
Accuracy
4.2 4.2

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API pH TEST & ADJUSTER KIT 250-Test Freshwater Aquarium Water pH Test and Adjuster Kit (29A)
API pH TEST & ADJUSTER KIT 250-Test Freshwater Aquarium Water pH Test and Adjuster Kit (29A)
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Price-13% $15.93
List:$18.28
-29% $13.99
List:$19.78
$13.98-29% $7.98
List:$11.28
-29% $11.98
List:$16.78
-29% $11.99
List:$16.78
Delivery
Get it Apr 1 - 4
Get it Apr 3 - 9
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Customer Ratings
Easy to use
4.6
4.5
4.4
4.2
4.6
4.2
Easy to read
4.5
4.2
4.6
4.1
4.6
4.1
Accuracy
4.2
4.2
3.9
4.0
4.4
4.2
Sold By
Deal4K
Kens Fish
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Amazon.com
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From the manufacturer

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test

Testing the Waters

In order for fish to thrive, water must be similar to that which could be found in their natural environment. Poor water quality can cause fish stress, illness and even loss. Most common water quality parameters are Ammonia, Nitrite, Nitrate, and pH. All may vary over time and all are invisible to the eye which is why it is important to test weekly. Testing aquarium water weekly will aid in keeping your most important water parameters within the proper range for your aquarium. Choose from a wide range of API testing options, such as our popular FRESHWATER MASTER TEST KIT or 5-IN-1 TEST STRIPS, for accurate water evaluation. Regular testing will help you easily determine your aquarium conditions.

Find Your Ideal Testing Style!

Test

Test

Test

Test

Your API Test Options

Choose the test method that works best for you. Whether you’re a bit pressed for time, or you prefer to measure your parameters on a more in-depth scale, or you only need to test one or two specific parameters, API has what you need!

Dip and Read

Just dip a 5-in-1 TEST STRIP in your aquarium, swirl twice, and compare to our color chart for fast and accurate results.

The Scientific Approach

For more detailed analysis, use the FRESHWATER MASTER TEST KIT, POND MASTER TEST KIT, SALTWATER MASTER TEST KIT, or REEF MASTER TEST KIT for precise readings of parameters.

Pick One (or Two)

Need to check your phosphate levels? What about ammonia? API offers specific test kits to test many different parameters, from general hardness and copper to pH and nitrate. Grab the one you need for a streamlined approach to testing.

Test Test Test Test Test Test
API QUICK START API AMMO-LOCK API pH UP API pH DOWN API NITRA-ZORB API PHOS-ZORB
Customer Reviews
4.7 out of 5 stars
12,064
4.6 out of 5 stars
4,830
4.6 out of 5 stars
611
4.5 out of 5 stars
1,621
4.4 out of 5 stars
2,519
4.5 out of 5 stars
411
Too much nitrites?
Too much ammonia?
Inappropriate pH levels?
Too much nitrates?
Too much phosphates?
test

Making a Better Underwater World

At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 3.25 x 1.88 x 5.13 inches; 6.4 ounces
  • Item model number ‏ : ‎ 29A
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ October 19, 2006
  • Manufacturer ‏ : ‎ Mars Fishcare
  • ASIN ‏ : ‎ B001QXR454
  • Customer Reviews:
    4.6 4.6 out of 5 stars 774 ratings

Looking for specific info?

Product Description

Keep your fish healthy and thriving by testing your aquarium water's pH regularly with easy-to-use API Freshwater Aquarium pH Test Kit. Testing water parameters weekly helps prevent invisible water problems that can be harmful to fish. pH is the measure of acidity of water, on a scale ranging from 0 to 14. A pH of 0 is the most acidic, while a pH of 14 is the most alkaline. Different geographies have different tap water conditions with different pH levels, while fish require a specific pH level to thrive. A pH of 7.0 is ideal when keeping a community aquarium containing a variety of tropical fish. Goldfish and livebearers prefer a pH of 7.5. Many Amazonian fish, like angelfish and neon tetras, prefer a pH of 6.5 to 6.8. Mollies and swordtails thrive at pH 7.2 to 7.5. API Freshwater Aquarium pH Test Kit contains 1 pH test bottle, instructions, capped test tube, and color card for easy pH level testing in freshwater aquariums. API Freshwater Aquarium pH Test Kit test a wide range of pH levels from 6.0 to 9.0. Use the color-coded chart to determine if your water is safe or if adjustments are needed. Then follow the recommendations to treat the water – it's that simple!

With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.

Important information

Directions

Directions: push down on cap while turning to remove childproof safety cap. Fill a clean test tube with 5 ml of water to be tested (to the line on the tube). Add 3 drops of pH test solution, holding dropper bottle upside down in a completely vertical position to assure uniformity of drops. Cap the test tube and invert tube several times to mix solution. Read the test results by comparing the color of the solution to the pH color card. The tube should be viewed in a well-lit area against the white area of the card. The closest match indicates the pH of the water sample. Rinse the test tube with clean water after use. A pH of 7.0 is ideal when keeping a community aquarium containing a variety of tropical fish. Goldfish and livebearers prefer a pH of 7.5. Many Amazonian fish, like angelfish and neon tetras, prefer a pH of 6.5 to 6.8. Mollies and swordtails thrive at pH of 7.2 to 7.5. To raise or lower pH in a freshwater tank, use API pH UP or pH DOWN. To automatically adjust pH to a preset level, use API PROPER pH 6.5, 7.0, or 7.5.

Customer reviews

4.6 out of 5 stars
4.6 out of 5
774 global ratings

Customers say

Customers like the quality, readability, and performance of the pet supplies. For example, they mention the test part is great, easy to use, and accurate. That said, opinions are mixed on the value.

AI-generated from the text of customer reviews

27 customers mention22 positive5 negative

Customers like the quality of the pet supplies. They say the test part is great to tell you if your pH is too high or low, and the kit is great for testing the pH in your aquarium. The tester is very accurate, but a little confusing to set up for the first time. The kit is able to test for everything and will last a very long time. Customers also mention that the test strips seem more accurate.

"Accurate and easy to use but be aware that if you have a large aquarium (i have a 29-gallon) that the PH adjustment bottle that comes with this test..." Read more

"It works well and is a great product that is easy to apply. There is a test tube and indicator drops and a color chart for the test results...." Read more

"tester is very accurate but a little confusing to set up for the first time" Read more

"Looks like a great kit except it needs a dropper to obtain the 5mls of aquarium water needed for the test...." Read more

25 customers mention22 positive3 negative

Customers find the pet supplies very simple to use, with detailed instructions. They say it's easy to apply, test, and read.

"Accurate and easy to use but be aware that if you have a large aquarium (i have a 29-gallon) that the PH adjustment bottle that comes with this test..." Read more

"It works well and is a great product that is easy to apply. There is a test tube and indicator drops and a color chart for the test results...." Read more

"Just right for my tropical tank, easy to read an quick. I got this because of the value for the price...." Read more

"...The results are SO clear and easy to read." Read more

21 customers mention18 positive3 negative

Customers like the performance of the pet supplies. They mention that it works great, produces clear results, and is effective at testing and lowering hardness.

"It works well and is a great product that is easy to apply. There is a test tube and indicator drops and a color chart for the test results...." Read more

"It worked great" Read more

"...The results are SO clear and easy to read." Read more

"...4 Stars for product appearance, 5 stars for product effectiveness, and 5 stars for arrival time! All in all, happy customer here. :)..." Read more

13 customers mention9 positive4 negative

Customers are mixed about the value of the pet supplies. Some mention it's great value for the price, while others say that it'll be a waste of money.

"...it was about 20$ more for all of these products but this is cheaper with everything and just as effective." Read more

"Easy to use, good price excellent product" Read more

"...Total waste of money." Read more

"Great value for your money awesome products for your fish tank" Read more

5 customers mention0 positive5 negative

Customers are dissatisfied with the ph level of the pet supplies. They mention that it didn't change the least bit, makes them want to lower the pH, and that it doesn't really help.

"Not worth it. Does not really help. Get some Ph test strips and change your water" Read more

"Seems to be accurate but the Ph down has not worked to decrease PH level." Read more

"...More of question than review but why does this kit make me want to lower the pH when everything's fine from other testers...." Read more

"...This product never changed the pH of our water." Read more

Top reviews from the United States

Reviewed in the United States on January 17, 2024
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One person found this helpful
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Reviewed in the United States on July 11, 2015
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4 people found this helpful
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Reviewed in the United States on July 5, 2023
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Reviewed in the United States on October 28, 2023
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Reviewed in the United States on March 13, 2023
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One person found this helpful
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Reviewed in the United States on May 15, 2023
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Reviewed in the United States on July 1, 2020
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Reviewed in the United States on September 22, 2022
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Top reviews from other countries

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ChinSeng Neo
3.0 out of 5 stars 3 Bottles in one pack but different expiry dates.
Reviewed in Singapore on March 11, 2024
Style: pH & AdjusterVerified Purchase
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ChinSeng Neo
3.0 out of 5 stars 3 Bottles in one pack but different expiry dates.
Reviewed in Singapore on March 11, 2024
3 Bottles in one pack but different expiry dates. From Dec 2025 to Jan 2026
Looks like old stock as its Mar 2024 now.
My old PH Test Solution bought in Singapore had expiry date 3+ years from when bought
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Amazon Customer
3.0 out of 5 stars Tester is great
Reviewed in Canada on September 16, 2023
Style: pH & AdjusterVerified Purchase
jeep
4.0 out of 5 stars Ensembles de test API!!!
Reviewed in Canada on September 4, 2022
Style: pH & AdjusterVerified Purchase
Dude
1.0 out of 5 stars Test tube broke
Reviewed in Canada on March 3, 2024
Style: pH & AdjusterVerified Purchase
jeanrobin
4.0 out of 5 stars Four Stars
Reviewed in Canada on March 20, 2018
Style: pH & AdjusterVerified Purchase