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DIY Drop Checker

280K views 357 replies 80 participants last post by  HeyPK 
Looking at some of these designs I would like to offer up another idea.

Why not use a test with a single hole rubber stopper. The insert a glass tube into the hole. Invert the whole thing and your done.

I was looking around and you can buy these parts for < $5.

The only question I have is the effect the rubber stopper would have on the solution.

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