Glass Test Tubes with Leak-Proof Screw Caps and 5 ml Mark, 6 pcs, for Aquarium Water Checks (85mm)

So much better than the tubes that came with the API kit. I especially like the screw on tops. Great quality product.

One of my API tubes crushed in my fingers trying to remove the cap to clean it. Fortunately I did not get cut. I searched for replacement tubes with screw top caps. I found these and decided to give them a try. These are a great replacement. However these seem to have thinner glass than the API tubes but with the screw top caps it shouldn't be a problem crushing then in my fingers. The mouth is narrow so care needs to be taken when adding the drops. These may break easily if knocked over. But I'll take these over the miserable API caps.

I broke a few API test tubes and decided to acquire some replacements. The original API test tube is quite expensive when sold separately. I chose this brand and model since they have the 5ml markings and they also have a nice top cap that screws in the tub, avoid spills when shaking the tube. The only downside is that the neck of the tube is narrow, and if one wishes to dry up the tube with a paper towel sheet the narrow neck compresses it a lot and the paper does not properly touch the inside of the tube. But that can be bypassed using another cleaning method. All in all, an affordable replacement to the API original test tubes.

One of my API master test kit test tubes shattered when I was trying to get the lid off, so I hit Amazon for a replacement. These worked really nicely, and I like the screw top. It's a little trickier to get on but taking the cap off is actually easier. I didn't have any issues with the slightly smaller opening. I tested the line marker with a measuring lid and it's in the right place.

These are so nice especially the screw-on top. I broke my last tube pushing the top on and I thought I'd have to buy a whole new test kit wasting the remaining chemicals in the old one. I bought these to do water testing for my aquariums. Very nice tubes!!

When lined up some of these tubes have the 5ml mark in different places so some are incorrect. Luckily I use a 5ml medicine dropper to make sure in putting in the right amount to check my aquarium parameters. Other than this I'm happy with purchase.

These are by far the best test tubes I’ve bought. Love the twist cap so there’s no leakage and the glass is nice and thick!

the price on this was cheap, so i don't know if i should knock off a star or two. i closed the plastic top on one of them and i heard the glass crack. i don't think applied that much pressure. i threw it away. i guess i'll be super duper careful with the others.

These vials are the best. Where have they been all my life?! Seriously, the screw caps are just the best. No more leaks while mixing up test vials. Plus the glass is tops. Thicker and much stronger than the stock API vials. The sole drawback is they are slightly necked, which makes it a little bit trickier to get the water and reagents into the vial and can airlock when trying to dump the vials. This is not a big deal at all, though. Use a pipette to get your water sample, give the vial a little shake when you're dumping it to overcome the airlock, and use API test kits which all have really nice liquid dropper bottles and no fiddly powders and such to deal with. It's really not that tough to add drops of reagent. Trust me, if you keep fish, you want these vials. The seller, Tililly Concepts, also makes a terrific acrylic vial rack that is a great thing to pair these with if you want the super deluxe setup. One more thing ... The product pic makes it look like these have rounded bottoms. This is not the case. They have flat bottoms similar to the stock API vials.

These are a great replacement for the API test kit tubes which we all know break easy. Totally recommend this product. The seller was fast and everything went smoothly

They do the job, but i dont like how the opening is narrow and water gets blocked by suction. Screw cap is nice opposed to snap on ones

Leak proof. Lost a star to the narrow opening, otherwise great product.