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

Perfect replacement for the awful APT glass tubes that I broke and just found fiddly.No leaks with these and screw on tops plus plastic so no breaking.

I bought these because I make up my homemade electrolytes to add to water (like lmnt) and these are perfect to hold the serving in and take with you. They are screwed on so the my won't accidentally pop open and spill everywhere. They seem very durable as well so I can't see them breaking unless under extreme pressure.

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.

The selling point for me was self-standing and screw top lids. The tubes were sealed in an anti-static reusable closure pouch. Each tube is marked at each 1ml mark. These are perfect for experiments, mixing ingredients. I cannot comment on durability and plastic strength but would think you would not want to use anything that would interact with plastic. For my use, these were strong enough and work great for mixing single serve koolaid packets and a few for mini reef measurements/dosing. The lids also do not leak, which is important for the reef tank.Enhancements: Should offer a glass version for different chemicals that interact with plastic and larger sizes.Overall, these were a good find and would re-purchase if needed.

I bought a kit to test the water in my pond. It came with 6 glass test tubes which just shattered taking on and off the caps. These are plastic and excellent -- easy to fill and empty if too much water was put in for the test. It is a screw on cap. The test tubes are plastic. The reason I gave it 4 stars instead of 5 is that the markings are hard to read. I am going to use a sharpie or nail polish to mark the line I need for my testing. That is the only issue. Otherwise, better than the original.

Quick shipping and arrived undamaged. All tops fasten without leaking. Volumes are not painted on, they are raised plastic so will last longer.