3M LeadCheck Swabs, 48-Pack Detects lead on most surfaces within 30 seconds EPA recognized Simple to use: just crush, shake and swab. Red means lead! Test confirmation card to verify results in every kit Swabs are non-toxic, odorless, disposable and non-staining EPA recognized on painted wood, metal, plaster or drywall Detects lead down to 600 ppm Test confirmation card to verify results in every kit Contains 48 ready-to-use disposable swabs that turn red when lead is found