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API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored

4.8 4.8 out of 5 stars 28,076 ratings

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Freshwater

Purchase options and add-ons

  • Contains one (1) API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, including 7 bottles of testing solutions, 1 color card and 4 tubes with cap
  • Helps monitor water quality and prevent invisible water problems that can be harmful to fish and cause fish loss
  • Accurately monitors 5 most vital water parameters levels in freshwater aquariums: pH, high range pH, ammonia, nitrite, nitrate
  • Designed for use in freshwater aquariums only
  • Use for weekly monitoring and when water or fish problems appear

Customer ratings by feature

Instruction quality
4.7 4.7
Accuracy
4.6 4.6
Easy to use
4.5 4.5
Easy to read
4.5 4.5

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Product guides and documents

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 9.13 x 3.5 x 4.63 inches; 1.15 Pounds
  • Item model number ‏ : ‎ 34
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ June 20, 2004
  • Manufacturer ‏ : ‎ Mars Fishcare
  • ASIN ‏ : ‎ B000255NCI
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.8 4.8 out of 5 stars 28,076 ratings

Looking for specific info?


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
12,070
4.6 out of 5 stars
4,831
4.6 out of 5 stars
611
4.5 out of 5 stars
1,621
4.4 out of 5 stars
2,520
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 Description

Most water problems are invisible to the eye. Quickly measure and modify the six aquarium levels that are most important to the health of your freshwater fish with the API FRESHWATER MASTER TEST KIT. To stay healthy and thrive, fish need properly balanced levels of ammonia, pH, high range pH, nitrite and nitrate. These levels can change rapidly and create harmful conditions when fish waste, uneaten food or other organic matter accumulate, or when untreated water is added. If left uncorrected, all of these can be harmful or even fatal to fish, with consequences such as reduction of oxygen, increase in stress and higher risk of disease. The API FRESHWATER MASTER TEST KIT measures these six parameters with scientific accuracy and provides professional results. It comes with four test tubes, a holding tray and computer calibrated, laminated color card. Just fill the test tubes, add the test drops and compare results to the color card. Then follow the recommendations on the card if action is required.

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

Safety Information

Please Read Instructions Before Use

Ingredients

Includes Four Test Tubes, Caps, Computer-Analyzed Laminated Color Charts, Instructions

Directions

Follow the instructional booklet directions for individual testing of each water parameter, and test weekly for best results.

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API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored
API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored
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Price-29% $35.98
List:$50.48
-31% $34.98
List:$50.48
$11.99$11.99-13% $12.99
List:$14.99
$29.99
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Accuracy
4.6
3.7
3.7
3.1
4.2
Easy to use
4.5
4.0
4.4
4.0
3.8
Easy to read
4.5
4.0
4.0
3.9
Sold By
Amazon.com
Amazon.com
Umlecoa Warehouse
One Way Pet
Kovspo
Pro.Products.LLC

Customer reviews

4.8 out of 5 stars
4.8 out of 5
28,076 global ratings

Customers say

Customers like the ease of use, accuracy, performance, quality and value of the pet supplies. For example, they mention that it's very easy to use with clear instructions, accurate and works well. Some are happy with value, and health. That said, some complain about the leakage.

AI-generated from the text of customer reviews

1,607 customers mention1,318 positive289 negative

Customers like the quality of the pet supplies. They mention that it's a very suitable test kit, with glass test tubes and full coverage plastic test. They also say that the tests are pretty good, and the product is a dependable performer. Customers also say it'll last years and is better than strips.

"...This updated version has great test tubes. Previous versions had glass tubes with caps. The waterline was printed on and would eventually rub off...." Read more

"Great product. Clear instructions, easy to use, plenty of tests, great price, packaged nicely; easy to store." Read more

"These are far better then the strips and are more accurate!" Read more

"I have trouble reading a few of the colors sometimes but a good kit overall." Read more

1,083 customers mention1,013 positive70 negative

Customers find the pet supplies easy to use with clear instructions. They also say it covers all the bases and provides good explanations on how to use. Customers also mention that most of the tests are easy to do, with the exception of nitrate. They say it's much easier than using paper strips and much more accurate.

"...They're all easy enough to read, and even if you can't find an EXACT match to a color on the chart, you'll get a pretty good idea of what your..." Read more

"Great value. Covers all the bases. Gives good explanation on how to use. Wish the bottle for pH was a little larger." Read more

"This is a must have for aquarium keeping, very easy to use, versatile, and informative...." Read more

"...They have attached flip caps.It's pretty straightforward and easy to use, just be sure to read the directions...." Read more

619 customers mention504 positive115 negative

Customers like the accuracy of the pet supplies. They say the API Master test kit is the most accurate and gives the quickest results. They also say the tests are accurate and the number of tests is great. Customers also say that the kit is far more accurate than using strips and is cheaper in the long run.

"...seems to be accurate, and provides all the tests the average tank owner would need...." Read more

"...Will always get these kind of things from Amazon. Seems fairly accurate, easy to understand instructions and easy to use." Read more

"These are far better then the strips and are more accurate!" Read more

"...It's a weight of pros and cons between speed, accuracy, and ease of use when it comes between the testing kit or test strips...." Read more

600 customers mention543 positive57 negative

Customers appreciate the value of the pet supplies. They say it's pretty inexpensive, accurate, and saves them money over the strips.

"...It is pretty inexpensive ($20 cheaper here than at my local pet store, and certainly more cost effective than buying test strips), seems to be..." Read more

"Great value. Covers all the bases. Gives good explanation on how to use. Wish the bottle for pH was a little larger." Read more

"Great product. Clear instructions, easy to use, plenty of tests, great price, packaged nicely; easy to store." Read more

"...I do believe in giving credit where credit is due and this kit is affordable which is great for those just starting to get into the hobby!..." Read more

555 customers mention476 positive79 negative

Customers like the performance of the pet supplies. They say that it works well, is easy to follow, and provides great results. Some say that the tests work flawlessly and are much cheaper than paper strips. Overall, customers find the product to be a decent and useful product.

"Works as expected. Cheaper than going to your lfs. Will always get these kind of things from Amazon...." Read more

"...While it still performs nicely, I can't attest to how long it'll last verses the glass ones. But!..." Read more

"Works great and gives accurate results as long as you follow instructions exactly" Read more

"...I don't know how accurate it is though but seems to be working well. I'd recommend this!" Read more

192 customers mention192 positive0 negative

Customers like the health of their fish with the test kit. They say it helps increase fish life and increase their quality of life. Customers also say it keeps them on top of things and makes them focus more on their tank. They find the kit easy to use and provides solutions to problem results. Customers say it has saved all of their pets lives.

"...it is amazing for any stage tank and any beginner or expert in the aquarium hobby." Read more

"...They even added tips to increase and lower levels for everything this kit tests for.*..." Read more

"Get it. Get it. Get it. It will save your fish. Help you maintain a routine when it comes to water changes and gravel cleaning...." Read more

"Necessary to maintain any healthy aquarium. I hate the glass vials, though...." Read more

210 customers mention87 positive123 negative

Customers are mixed about the color of the pet supplies. Some mention that there is a nice color-coded chart on the back of the instruction manual that helps them see the true color. They say the colors are easy to read, however, sometimes they don't match exactly. The card to check colors is laminated so it doesn't get wet. However, some customers say the color differences are very subtle, the instructions for reading the colors is quite poor, and the colors get distorted after a while.

"...downside is it can be a little bit labor intensive and the color scale is subjective." Read more

"...The directions are easy the follow and the color comparison chart works great...." Read more

"...The booklet has been cheaply printed and this is very important, as the more you use the kit the more you come to understand that the colors of your..." Read more

"...of the results taking with my iPhone on flash (in review) helped me see the true color. holding them up outside works well...." Read more

160 customers mention18 positive142 negative

Customers are dissatisfied with the leakage of the pet supplies. They mention that the caps sometimes leak while shaking the vials, the lids on the vialls leak slightly while you are shaking them, and the liquid comes out on the sides of the cap.

"...The ammonia and nitrate tests can be a little messy as water can seep around the cap, so I use cling wrap or parafilm, making sure to keep one..." Read more

"...It does leak a tiny bit which is frustrating but it’s the first out of many others I have purchased so can’t be mad." Read more

"...There's no visible breakage, but it leaks water whenever I shake it and tip it upside down...." Read more

"...When I try to add the drops to the test tube, the liquid comes out on the sides of the cap, so I can't get an accurate amount of the chemical into..." Read more

Very Good
5 Stars
Very Good
The instructions are very clearly written and easy to follow. My only complaint is that one of the rubber nipples on the pH bottle came damaged, but it isn't unusable. The directions and the bottlea both clearly state how many drops of each solution to use, and the color guide on the back isn't faded or anything. They even added tips to increase and lower levels for everything this kit tests for.*The water I tested for the review photos hasn't been cycled/the tank was set up a few days ago—I will not be getting fish for another two months lol
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Top reviews from the United States

Reviewed in the United States on March 7, 2012
Style: FreshwaterVerified Purchase
One person found this helpful
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Reviewed in the United States on January 27, 2024
Style: FreshwaterVerified Purchase
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Reviewed in the United States on January 20, 2024
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Reviewed in the United States on January 13, 2024
Style: FreshwaterVerified Purchase
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5.0 out of 5 stars Accurately Know Your Tank's Parameters
Reviewed in the United States on January 13, 2024
I've been keeping freshwater fish for awhile and using the API Master Test Kit. It's far more accurate than the test strip.

This updated version has great test tubes. Previous versions had glass tubes with caps. The waterline was printed on and would eventually rub off. These tubes are plastic with permanent waterline molded in. They have attached flip caps.

It's pretty straightforward and easy to use, just be sure to read the directions. To read the nitrates, for example, prior to adding the the drops from the second bottle, you must shake the bottle for 30 seconds then after adding to the tube, shake that for one minute. Just be sure to read the instruction booklet and you'll be fine.

The kit is long lasting, I usually replace 12 to 18 months.
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11 people found this helpful
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Reviewed in the United States on December 13, 2023
Style: FreshwaterVerified Purchase
Reviewed in the United States on January 16, 2024
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3 people found this helpful
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Reviewed in the United States on February 21, 2024
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Reviewed in the United States on March 21, 2024
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Top reviews from other countries

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Wolfden
5.0 out of 5 stars Great all in one kit
Reviewed in Canada on February 5, 2024
Style: FreshwaterVerified Purchase
Eduardo Posadas Núñez
5.0 out of 5 stars Excelente producto
Reviewed in Mexico on November 12, 2023
Style: FreshwaterVerified Purchase
Arun Kumar
5.0 out of 5 stars Geniune Product
Reviewed in India on November 26, 2023
Style: FreshwaterVerified Purchase
B. A. Harrison
5.0 out of 5 stars Excellent product - 400 tests!
Reviewed in Australia on February 2, 2024
Style: FreshwaterVerified Purchase
MR
5.0 out of 5 stars Best kit for overall price and good accuracy. Few caveats but still highly recommend.
Reviewed in the United Kingdom on May 29, 2017
Style: FreshwaterVerified Purchase
43 people found this helpful
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