We can measure the concentration of ozone in a range of 0-200 ppm with an accuracy of 0.1 ppm. The measurement is carried out with a portable hand-held detector, which is equipped with a flexible tube that can be used to collect air locally in a desired site of interest. For ozone measurements we have a dedicated laboratory, where we can measure the concentration of ozone in the room through an opening. This is particularly useful for testing ozone generators as well as the ozone output of UVC light sources. Currently we also use the detector to develop portable disinfection chambers, where we measure the level of ozone inside the system.