The Model 4500 Mk III uses a homogeneous advanced LED light source combined with a Flood LED to achieve high levels of stability and accuracy. Its no-moving-parts optical system provides the compact and relaible dust emissions monitor. This model is suited for all types of industrial applications where dust emissions measurement is required. It carries a wide range of compliance and performance approvals, including US Environmental Protection Agency. The model includes options for adapter flanges, air purging and other accessories.