Perfect! Exactly what I was looking for! I'm very clumsy and broke all of my API test tubes that came with my test kit, so I knew I needed something more permanent. I've dropped them off the counter, stepped on them, dropped things on them and they didn't jump or even move! It holds over 5mL and the screws on it just don't stick like the API tubes I LOVE! So I can shake the tube aggressively and no water comes out. Needless to say, I LOVE these vials and would recommend them over API glass vials any time!
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