S221 Refill Wicks for the S220 Smoke Pen come 6 per package. Each refill wick burns for up to 30 minutes producing a dense stream of white smoke perfect for checking drafts around doors and windows, chimneys, duct work, clean rooms, fume hoods, kitchen hoods, hospital isolation rooms and hundreds of other applications. Great for checking scent trails when K9 scent training.
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