The SDL Atlas Ozone Exposure Chambers determine the resistance of the color of textiles to the presence of ozone in the atmosphere at room temperature with relative humidities not exceeding 67 percent. The instrument offers a high output ozone generator, touch screen controller, closed-loop ozone concentration control and a rotating sample rack that can hold up to 24 specimen. Easy set-up features allow both set and current test parameters to display on the screen, providing increased control and accuracy in test results. Two models are available. The Ozone Exposure Chamber plus offers higher ozone concentrations and a more precise control, while the Ozone Exposure Chamber is the economical model capable of performing a basic test.