The RadTrak radon gas dector accommodates the preferred EPA long-term test protocol to account for daily and weekly fluctuations in radon gas levels, contrasting a 2-5 short term test which could yield a false high/low report. The Radtrak has been used by the US Environmental Protection Agency, US Department of Energy, US Department of Defense, National Institute of Health, American Lung Association, and numerous other public and private organizations and is trusted worldwide.