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Find hidden leaks in your ducts and equipment efficiently and safely with our Smoke Pen 3 Hour from Regin! Our smoke pen produces clean, non-toxic oil-free smoke that rapidly reveals airflow leaks and defects in heat exchangers, air ducts, chimneys, tanks, boilers, and piping. Its odorless, non-staining formula ensures your indoor environment is kept safe while performing maintenance tasks. Plus, our smoke pen doesn't require explosives or contain hazardous materials making it an essential tool for fire drills, leak testing, and safety inspections. Achieve superior performance in your HVAC and refrigeration applications with this easy-to-use and reliable smoke detection solution today!