API Replacement Test Tubes for Aquarium Test Kits 6 Pack Bundle

They’re ok with caps; but there’s no measured fill line for the tests! Since they’re API- they should have the fill line on each vial for the each test.

Perfect replacements . Good price

API tubes work, but they are a pain. Theyre made nice, but are poorly designed. Thy are thin and break easily. Theyre too narrow, and fall over all the time. The caps dont close properly. When you remove the caps liquid always drips down the outside of the tube, so titration tests are a mess. If the test requires much shaking you end up with chemicals leaking out, even if you hold them tight. Im not sure about the accuracy of the 5mil marking. If I fill them with a syringe 5mil is always a bit higher than the mark (the bottom of the meniscus is clearly above the line). It may be accurate for freshwater, IDK. It probably doesnt matter as long as you use the same method each time, but you would like everything to be precise. Titration tests are A LOT easier in a container that is wider and that you can swirl.

These are the exact same ones as I received in the master freshwater test kit. They have the 5ml lines on them with the api logo, complete with lid. I was concerned that they did not have the 5ml line when ordering, but they in fact, do. Pick up some of these if you have more than one tank.

Just what I needed...

So great Now I can do multiple tests on both my tanks

All I needed was one. What am I going to do with the rest?

I thought they would come in a box like the picture showed but instead they came in a plastic bag. The box just would have been more convenient to store them. But they are the exact tubes that come with your api test kit.

If you have an aquarium you know that you need these. And I have already gone thru a pack of these. This is my 2nd. I dont know if they are just thin or Im just too rough. But Ive had tanks for years and in the last 6 months Ive gone thru the original 4 from the master test kit and a extra pack of 6. I have broken 2 from this pack. Just regular use. These are labeled as API. They have the lines to where you add the water. So caution when using, especially with children.

First of all, the tubes were shipped from Amazon with NO padding, so 2 of the 6 were shattered and a third was cracked. I really needed more tubes for water testing so I kept the remaining 3. The glass seems thinner than the tubes that came with the Master Test Kit, so I am not convinced these are real Api test tubes. And just now I was testing my aquarium water, I went to remove the cap from one of the test tubes so I could add the second nitrate test solution, and the test tube shattered in my hand. It sent shards of broken glass all over my kitchen, and the test solution left a big yellow stain on my kitchen counter. Luckily there was only one piece of glass embedded in my hand and I was able to remove it without much difficulty.