Any ideas for a test tube?

what are the dimensions?

if its a small test tube I would reccommend making a portable vape instead of a pipe.

 

diamond drill holes in the bottom to make it a diffuser in a homemade bong

I did it with cigar tubes, just be careful glass lime to break easy.

 

a small bubbler. put a lid on top with two holes in it; one for a downstem and the other for a mouthpiece.

http://whatabong.com/wp-content/uploads/2011/01/test-tube-bubbler.jpg

 

where's OP?

 

Have been a college lab assistant, I would suggest that you wash it VERY well before using it!

 

I use test tubes for downstems. They work very nicely, although they're a bit fragile.