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๐งฌ Keep your fish thrivingโtest smarter, not harder!
The API NITRITE TEST KIT offers 180 precise liquid tests designed for both freshwater and saltwater aquariums. It accurately measures nitrite levels from 0 to 5 ppm, helping prevent harmful spikes that can suffocate fish and suppress their immune systems. The kit includes a testing solution, color card, capped test tube, and instructions, making weekly water monitoring simple and reliable for maintaining a healthy aquatic environment.



















| Customer Reviews | 4.7 out of 5 stars 3,262 Reviews |
J**F
Much better than test strips
Iโve been using the API Nitrate Liquid Test Kit for a while now and itโs been rock solid. The instructions are clear, the bottles are easy to work with, and the color chart is straightforward to read under normal lighting. I appreciate that itโs a true liquid test and not strips, so the results feel much more reliable and consistent. The test has helped me stay on top of nitrate levels in my tanks and catch trends before they become problems. The reagents last a long time, and as long as you follow the directions and shake bottle #2 thoroughly like it says, the readings are repeatable. Overall, itโs accurate, dependable, and worth having if you care about water quality. I wouldnโt hesitate to buy it again.
O**N
Good little test kit
A must when setting up a new fish tank to make sure all parameters are safe before adding your inhabitants.
H**B
Reliable and Easy-to-Use Kit
This Aquarium Water Test Kit is reliable, easy to use, and very helpful for keeping aquarium water safe. It provides accurate nitrate readings for both freshwater and saltwater tanks, making it great for monitoring water quality and preventing algae problems. The kit includes clear instructions and enough tests to last a long time.
J**B
Works well
Good to have on hand if your are new to fish aquariums or changing tanks.
M**I
Ask yourself - Does it have Orange when looking at results.
This Nitrate test is very good. Honestly, I used both the Salifert and API versions and they both work good. What is nice about the API version is that you can use the acid to test if rocks have carbonate in them by dropping a couple of drops on a rock to see if it bubbles. (look it up). Also, about the colors. It gets hard to distinguish the colors. The way that I do it, is I ask myself "does it have orange in it? If so, then it is one of the Orange. Then I ask myself if there is no orange then it is red! Or if their is no orange then it is Yellow. Seriously! Try it!. Do the test. Ask yourself if it has orange, or STILL has orange. it will then be easier to match to the card! I hope I explained that well. Good Luck
R**G
Great Test Kit for the price, it gives you a pretty good estimate of your Nitrates when they are high.
API kits are fairly accurate for the price, I highly recommend them for salt water aquarium owners that need and should have at least 2 kits of every important test type so they can cross reference results if they feel something is wrong with a particular test result. API fills that niche perfectly with pretty accurate easy to use kits that cost a quarter the price of the more accurate ones like Salifert, ELOS and Red Sea Pro. The API Nitrate Kit is as simple as it gets, just fill the vial to the marker or better yet use a syringe and add 5ml as directed. Then add 10 drops of reagent "A". swirl for a bit then shake reagent "B" for 30 seconds very vigorously and add 10 drops of that. Shake the whole thing for one minute vigorously and then wait 5 minutes to get a result. IMPORTANT NOTE: If you forget to shake reagent "B" you might as well throw the whole bottle of reagent out. This solution separates out in the container after a few hours into layers of different chemicals. If you don't shake it, you will be dripping out 10 drops of just one of those chemicals and remaining mixture will be compromised. The end result is that the next time you use it and shake it up properly the typically result is a lower reading than normal. Just remember to always shake reagent B properly for 30 seconds and you wont have any problems. If your Nitrates go down to reading Zero on the API kit, then it's time to move to a more accurate kit that is designed to read very low Nitrate levels. If your keeping a SPS Reef Tank you need the Nitrates to be near Zero and the API kit will not be accurate enough to read the small amounts that may be in your aquarium. For FOWLR Tanks, Nitrate is not as not as big of an issue, so an API kit or two is all you will probably need.
F**A
Works perfectly fine!
This test works perfectly fine. If people say it doesn't work then they're doing it wrong, just be sure to follow the instructions. It's pretty quick to use and last for quite some time so it's totally worth it, plus the test strips are not very accurate.
D**E
Good value for the money
Excellent product, good value for the money.
A**O
Accurate and reliable nitrate test kit for regular aquarium care
A very useful test kit for keeping track of water quality in both freshwater and saltwater aquariums. The results are clear and easy to read using the colour chart, which makes monitoring nitrate levels straightforward even for beginners. The kit feels well made, and the glass test tube is sturdy and easy to clean after use. The instructions are simple to follow, and the testing process only takes a few minutes, making it convenient for regular weekly checks. Itโs particularly helpful for spotting potential water quality issues before they affect fish or plants. Regular testing helps keep nitrate levels under control and supports a healthier aquarium environment. Overall, a dependable and practical kit that does exactly what it should. A good addition to any aquarium maintenance routine.
L**C
Buen producto
Producto indispensable para monitoreo de la salud de las bacterias que eliminan el amoniaco del agua salada de mis medusas.
D**5
Bon produit
Produit trรจs simple d'utilisation, fiable et pas cher, le top!
E**E
merci
merci marche tres bien
C**Y
Very easy to use
Easy to use. But I have to assume it is giving the correct reading. The colours can be a little vague.
Trustpilot
2 weeks ago
1 month ago