API NITRITE TEST KIT 180-Test Freshwater and Saltwater Aquarium Test Kit

Great product. Use it weekly.

It works.

Received quickly, but although the box appeared new, there was neither a test tube nor a color chart included. I can use other tubes, ok, but how to read the result with no color chart for comparison? Had to find a picture of it online. Clearly used, returned, and sent back out again, minus those key components.

This arrived with nothing but the liquid, the vile and color chart were missing.

It works.

Nice item as described

Kit is straightfoward to use. Theres a business-card size set of icons on the flip side of the color scale that guide you through usage, and its easy enough that you can figure it out solely from the pictures (there is also a verbose manual in the kit). I find the liquid readout easier to decipher than dip-strips. For most cases in an established aquarium, this test kit will provide the information that you need. Oftentimes you either have zero nitrite, or too much nitrite, and in the case of the latter, this kit is able to tell you whether you have more or less now than when you last tested. A word of caution for anyone doing fishless cycling of a tank: if you oversaturate this test reagent, it will read 0 ppm nitrite at the 5 minute time point. It takes around 100 or greater ppm nitrite to achieve this, and if youre oversaturating, you will see the reagent turn deep purple immediately, then slowly turn pale greenish-blue over time. If youre suspicious that the reading is oversaturated (this only applies if youre cycling a tank without fish, where you might incur substantial nitrite buildup but there are no fish to alert you by dying): just dilute the tank water 10 or 20-fold and test again to confirm your first result. Extending from this: if youre having a hard time measuring high amounts of nitrite because the shades of purple are too similar, just dilute your tank water a known amount, then read and multiply the result by the amount that you know you diluted.

Ive used this for years and love it. I stupidly ordered this by accident INSTEAD of the nitrate test kit because I cant tell the difference between a letter change, I guess (to be fair, theyre obnoxiously similar sounding terms even though AMMONIA is ALSO a form of nitrogen and yet IT doesnt have the pre-fix nitro- in the beginning of ITS name; wtf, chemistry?!)

Most accurate Nitrate test kit available

I have bought and used may API test kits over the years and they are usually a reliable product. But this one has me baffled. Is it a return or just a quality control issue. First off, upon receiving it, I took out the instructions to read them. HUM???? Instructions are for a NITRATE test kit, not NITRITE test kit. Ok, simple instructions are on the back of the color card. so, I start the test and add water & drops to the test tube, snap on the cap and turn it upside down as instructions. The water/fluid leaks out! I press on the cap hard but it still leaks. BUMMER!!!!!! None of my other test tube and caps leak. Come on API, get your act together. Is this a QC issue or do you sell seconds on Amazon????