Home inspectors and HVAC pros, this Regin smoke pen is an incredibly useful tool for detecting air leaks and drafts! The S220 model generates a thin, dense white smoke trail that makes even the smallest air movements visible. No batteries or messy fluids needed - just light the special wick with the included flameless lighter and you get about 30 minutes of smoke per wick. With 6 wicks included, that's 3 hours of testing time! Perfect for finding leaks around windows, doors, ductwork, electrical outlets, and during blower door tests. The smoke is safe, non-toxic, and low odor, making it suitable for indoor use. When you're done testing, just cap the pen to extinguish the wick - you can relight it later. The whole kit comes in a handy zippered case with the smoke pen, 6 wicks, instructions, and that rechargeable lighter. This is a must-have tool for energy auditors, building inspectors, and HVAC technicians who need to pinpoint exactly where air is leaking in or out of buildings. It saves so much time compared to other methods!