The world's first and most sensitive DIY rapid cigarette smoke residue test kit for pre-owned, rental, and commercial vehicles. Knowsmoke's patented design and sample collection system offers instant, precise, and affordable results for anyone concerned with cigarette smoke contamination in their next vehicle. Alternative solutions are overly complicated, time-consuming, and impractical. Skip the 10-14 day wait for lab results and uncover the smoke history of any vehicle in minutes. Suspect smoke but can't smell it? Don't worry. Knowsmoke deploys the same proven lateral flow immunoassay technology found in medical labs, with a detection threshold of 0.2 ng/ml. All testing materials are provided. Not recommended for in-home use on common household surfaces. Questions? Call toll-free (657) 837-5372. Cigarette smoke residue, also known as thirdhand smoke, is a dangerous collection of chemicals and carcinogens that remains on surfaces long after someone has smoked. These residues can be ingested, inhaled, and absorbed through the skin, potentially increasing the risk of certain cancers and other serious diseases. Material: Plastic.