I'm new to the board and have not yet signed in to the get to know you section yet. The thing that I have found is the Baby Soda Bottle Test Tubes from Steve Spangler Science work wonders. The nice thing with these comes from my clumsy nature of dropping things. These tubes will take a beating and will keep the blades free from dust and moisture with the screw on lids. Here is a link for you to follow.
http://www.stevespanglerscience.com/product/1389Jeremy
