Z-Color 10pcs 10ml Lab Plastic Frozen Test Tubes Vial Seal Cap Container for Laboratory School Educational

I test aquarium water parameters using these since they dont break easily like the glass ones do, plus these close very tightly which i love.

Thanks

Works great for chemically cleaning/soaking my 3D printer nozzles!

I ordered these test tubes for water quality testing. The API kit only comes with four. Having more test tubes allows me to perform testing on multiple tanks. They work pretty well. My only complaint is that liquid can get trapped underneath the seal in the cap, which makes it hard to clean them thoroughly.

Perfect for testing the water in a fishtank if you have one. Just what I needed and next day delivered. Thanks will buy again

these work great for testing my fish tank water perameters. they are the perfect size and durable.

I got a new toy which uses a pair off CR1/3N batteries, but claim to only run for about an hour. So carrying extra batteries seems in order. Those batteries are fairly small, and the distance between the plus and minus terminals is very little. So carrying a bunch loose is not an option.These appeared to be around the right size for those batteries, so I gave them a try. And they worked quite well. They easily held 3 pairs of the batteries, which should be adequate for most circumstances. The inner diameter is slightly bigger than the batteries and the length is slightly longer than a stack of 6 batteries, but it is close, and they don't rattle much. If it becomes a problem, a sheet of paper around the batteries and a bit of cardboard under the cap should fix it.They appear to be durable, and the lid attaches just right. The flat bottom means it stands on it's own, but the height compared to diameter means it is easy to knock over.I only needed one for the batteries, but I'm sure I'll find uses for the rest.

While the quality of these is decent, I can confirm that the other buyers who have incidated that the graduations on the sides of the vials are incorrect are making factual statements. Using these for anything that requires accurate measurements is a waste of time. I wanted to use these for aquarium water testing. The vials work fine for that purpose as long as you don't rely on the measurements on the vials themselves.Find a different option. These aren't worth a light sack of nickels.