You may want to do more than one test if:

• Your home’s foundation is over 2,000 square feet
• You have a basement and a crawl space – test in the basement and in the room above the crawl space     
• Your home is a 4-level split – test each floor that is in contact with the ground

The US EPA recommends you test the lowest level of the house that is regularly used for 8-10 hours per week. If you are making a follow-up measurement, the US EPA recommends placing a device on each level that is used for living space in your home. Do not test in the kitchen, laundry area, bathroom, crawl space, furnace room, or closet. Hang or place each device at least three feet away from exterior doors or windows and at least two feet off the floor. If you want to do a duplicate test, place the two devices side by side, 4″ apart.

When you are ready to start the test, cut or tear open the sealed plastic bag that contains the black device. As soon as you open this plastic bag, the device is “on,” and the test has begun. Do not remove or open the black plastic housing, or the results will be invalid.

Leave each device in place and undisturbed for at least 90 to 365 days.

Test results can be expected within two weeks of the lab receiving your test kit.