Quick and easy to use. Suitable for indoor and outdoor testing. Economical pricing for classroom labs and science projects Analyze these strips after only 10 minutes of exposure. Simply compare the stick's color with the color chart on the container for semi-quantitative results ranging from less than 90 to > 210 µg/m3 O2. An ozone content of 180 µg/m3 is considered a critical value above which sensitive persons should avoid strong physical exertion.

The measuring ranges are valid for a relative atmospheric humidity of 30 to 60 percent. Humidity values below 30 percent can cause lower ozone values or result in the inability to getting a reading, humidity above 60 percent higher values than actually present.