This test kit offers a quick and accurate radon level of your home or office. The kit includes 2 short-term radon gas detectors that can be used at the same time and location. The 2 test detectors satisfy real estate transaction requirements. Safe and easy to use. Meets all EPA and state requirements. Detects the invisible and odorless gas. Standard lab 2-3 business days to process. $40 lab analysis fee required for standard lab results. Prepaid postage envelope included in kit.