The Pro-Lab(TM) professional lead surface test kit detects poisonous lead on any surface you wish to test and is the most accurate and sensitive test kit available to consumers. Testing is safe and easy! The kit includes six non-toxic lead test pads and an eye dropper to help you perform the tests. The non-toxic chemically impregnated test pads, when moistened with water, provide the most effective and reliable results possible. The test pads detect the presence of lead to as little as 5 parts per million (as documented by tests conducted by the U.S. Consumer Product Safety Commission).