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Your cart is empty. API TEST TUBES serve as replacement test tubes for those included in API TEST KITS. Product comes with 24 capped test tubes in API box. Test tubes may be used with all liquid API TEST KITS.
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.
Melody D.
Reviewed in Canada on March 1, 2025
Awesome. Arrived ahead of schedule. NO breakage.I'm so happy I bought these. Much better than my plastic ones.
Wightman
Reviewed in the United Kingdom on February 17, 2025
Fantastic dint not realise they was made out of glass so now i realise why they bit on expensive side but I'm absolutely pleased with the product very well made and none was broken which is a bonus definitely worth paying the price for what they are api products are the best
Don Gray
Reviewed in the United States on August 23, 2024
API test kits have switched over to using plastic vials. While less breakable, the plastic ones become stained if you dont promptly clean them out thoroughly. Also the plastic 5mm lines are often difficult to see.These glass tubes are the actual API tubes with the 5 mm fill lines and very secure caps. They are far easier to clean out than the plastic ones and if capped are less likely to spill. Now sure youll occassionally drop one and break it. But with this set you'll have plenty to replace broken ones and do as many tests as you want to compare before and after readings. I got a tube holder here on Amazon that also allows me to have several sets of the 7 tests I do displayed without risk of dropping them or knocking the off tables. Really is well worth having these if you do the API water testing much.
Emmy
Reviewed in the United States on June 15, 2024
They're exactly what I wanted (the api test kits no longer come with glass test tubes, but with little plastic tubes that are harder to read because they're kind of foggy rather than clear and because they eventually stain). This was the most economical way to get glass tubes, and I'll probably have enough to last me the rest of my life, even if I were to break quite a few, lol.HOWEVER, the packaging leaves a lot to be desired. The tubes are in a thin paperboard box and that is tossed into a cardboard shipping box. Nothing is wrapped or protected at all. I'm honestly quite surprised none arrived broken.
Laura Burgos
Reviewed in the United States on May 27, 2024
Was in great need for replacement tubes for the kit. Great product .
tyler smith
Reviewed in the United States on December 18, 2024
The API Replacement Test Tubes with Caps are a fantastic solution for anyone in need of replacement tubes for their aquarium test kits. I use an API test kit to monitor the water parameters in my tank, and these replacement tubes fit perfectly. The quality is excellent—thick glass that feels durable and resists cracking or breaking during use. The included caps are a great addition, ensuring no spills or accidental contamination of test samples, which is crucial for accurate results. These tubes are easy to clean and work just as well as the original ones that came with my API test kit.What I really appreciate about these replacement test tubes is how versatile they are. They fit not only API test kits but also many other brands of aquarium test kits, making them a great universal option for anyone who needs new test tubes. For anyone using an API kit, these are an essential and affordable replacement part that keeps everything running smoothly. I highly recommend the API Replacement Test Tubes with Caps—they’re high-quality, reliable, and perfect for maintaining your aquarium's water quality testing.
Nick wiegers
Reviewed in the United States on November 22, 2024
Break easy but good price
Jerry P
Reviewed in the United States on January 29, 2024
You can see a mix of the glass tubes with caps in the test tube rack along with the plastic tubes that came with the original purchase of the API Test kit.The glass tubes fit very nicely in the rack . I'm glad I bought the glass replacement tubes. I also feel better using glass tubes and not worrying if the plastic tubes are absorbing any chemicals etc.I'm amazed they arrived unbroken. No protective package but obviously it wasn't needed.
Emily R.
Reviewed in Australia on May 22, 2023
Fantastic replacements! As I've broken some. I see they have gone up in price.
Alex Wells
Reviewed in the United Kingdom on July 30, 2021
after trying to take the cap off a test tube and taking most of the tube with it a got this replacement pack and it’s absolutely fab. the caps aren’t as tight (but still a perfect seal) so i’m not as worried about them breaking the test tubes as i try to get them open.
Solarstars
Reviewed in the United States on September 29, 2020
My son accidentally broke two of the glass test tubes that came with the ammonia and pH test kits. Just when I needed it most, I had nothing. The pandemic made it worse, where Petco and PetSmart were always out of stock. So, I made sure that I ordered a set of 24 in case of more accidents. The glass is not that thick but sheer so that you can make a good color reading which is important. I'm skeptical about using the plastic bottles because I'm not sure how clear they would be to make a good reading. Plus, I prefer glass for the share visibility. I wish the glass was more durable though, because the cleanup SAR another issue, tiny glass pieces can be missed and end up in your Barefoot. Ouch! Overall: good for sheer visibility color check. Value: could be cheaper as glass always needs to be replaced when broken.
Parent101
Reviewed in the United States on December 13, 2020
The API freshwater testing kit is wonderful. It is just the tubes tend to break if your are not careful. One broke one my son and one on me. Thus I ordered more test tubes. So far these seem to be working out great. The 5 ml marking is nice to have on the tube. Noticed some of the tubes sit a little snug in the API test kit area that the tubes are stored in vertically.Overall nice to have spares on hand.
Terrence Tan
Reviewed in Singapore on December 10, 2020
Received product in good order.
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