In each package there will be 3 test sticks. Once activated each stick lasts for 2 minutes. You wipe the end of the stick across the object you are testing. If the object contains lead, the stick will immediately turn red. If it doesn't turn red, you can continue to test objects until either the stick turns red or 2 minutes pass.
Lead poisoning is one of the leading health threats to children today.
High levels of lead in the blood of young children can produce permanent nervous system damage. Recent research indicates that even relatively low blood lead levels can produce significant nervous system damage, such as reduction in intelligence and attention span, reading and learning disabilities, and behavioral problems. The ingestion of lead-contaminated surface dust is the most common pathway of childhood lead poisoning. When crushed in the designated spots, the swab emits a yellow, non-staining liquid that is rubbed onto the testing surface. If the test turns red, there is lead on the surface.