Young4usYoung4us Watch Glass Beaker Cover Set, 6 Pcs Lab Watch Glasses in 150mm, 100mm, 70mm for Laboratory, Science and Chemical Experiment (150 mm x 2, 100 mm x 2, 70 mm x 2)

Showed up in perfect shape and matches my beakers well.

I use these daily. One larger one came chipped on the edge a little, but I use it anyway. They could be packed with slightly thicker foam between glasses. There were a couple of large glasses in the set anyway, so I'm not worried. The glasses are concave/convex a good amount, so liquids drip back down in the center of the beaker when heating solutions.

Work very well.Edges feel good and not sharp like my older covers.

I liked the packaging and the variety of sizes, but the glass could improve

The glasses seem fine but one of large ones was completely broken. I don't want to take the time to return it. It's just kind of disappointing.

I havent used them yet, but they appear to be exactly as advertised. They are likely tempered soda glass - fine for the intended/described use. They should NOT be directly heated - not used as container to hold something to be heated - not exposed to flame - not borosilicate. If this is news to you, you probably should not do what you're planning.

I guess what do you expect for the money? These watch glasses are a nice variety, and shipped fast when I was in a pinch. The glass is really thin. It is almost scary to hold. Just be careful about banging it against anything. I am almost afraid to hold it. I suggest holding it in a manner that if it does break in your hand , you can let go of the rest and hopefully avoid stitches.10/2023 edit : The large ones especially be careful. I have had 2 break in my hand. The pieces will fly, be careful. I have had one break right in the center in the shape of my beaker. These are not safe to use at all.

I am very happy to receive a complete set of goods, 150 mm, 100 mm, 70 mm two sets, the quality is also very good, bought to the children to school for experimental purposes, he also saw very happy, I hope he can do a happy experiment with him in school.I am very happy to receive a complete set of goods, 150 mm, 100 mm, 70 mm two sets, the quality is also very good, bought to the children to school for experimental purposes, he also saw very happy, I hope he can do a happy experiment with him in school.