Many UV curing systems produce ozone, which can be a health hazard for machine operators. Insufficient ventilation can result in hazardous ozone concentrations. These SAF-T-CURETM OZONE INDICATING PERSONELL BADGES comprise 10 ozone indicator sections, each sensitive to ozone in increments of .1/part per million within an hour of exposure, which change color from white to brown. Maximum reading capability of 1 part per million. To be worn or placed near the processing equipment. 10 badges/set.