Crosstex Ethylene Oxide (EO) Chemical Process Indicators (CPIs) are manufactured to monitor whether EO exposure conditions were met at the point of application using pressure sensitive adhesive. CPI-E02 are designed for hand-held labeling systems and can accept any ink-based print by hand-held labeling systems. CPI-E02 are intended for use with individual units (e.g. packs, containers) to indicate that the unit has been directly exposed to an EO process and to distinguish between processed and unprocessed units.