Click to view larger Image
10% Off Science by Age! Use code SKITS17C at checkout. Click for more details.
Glass capillary tubes that are 1.1 mm inside diameter (ID) and 75 mm long.
Seal one end of each tube by rotating it in the flame of a burner so that the tip is in the hottest part of the flame in a nearly vertical position (this will help avoid bending the end).