The Smoke Pencil puffer stick is the tool used to identify drafts and air leaks. Pull the trigger on the smoke stick and see how the smoke moves to show the air movement. You control the amount of smoke by using the trigger. The smoke is a perfectly mixed non-toxic sweet smelling Glycol, Glycerin and water solution vapor.
Transportation Note:Other types of smoke sticks and smoke puffers have very dangerous chemicals or flamables in them. Most of these other smoke sticks cant even be brought on a plane or sent via Air Package Carrier or US mail because of the dangerous chemicals they contain. This Smoke Pencil is different since it operates on a harmless glycol, glycerin and water vapor. Also the smoke fluid comes in a small 3 oz bottle that is the allowable size by TSA.