This STERIS Verify® chemical indicator strip, developed for use exclusively with the SYSTEM 1 EXPRESS / SYSTEM 1 PLUS Processing System provides added confidence that PAA was delivered during the sterilization cycle. This chemical indicator has been validated for use with the S40 Sterilant Concentrate in a processor having a six-minute Exposure Phase at a minimum of 46°C. A new chemical indicator strip is used for each sterilization cycle of the SYSTEM 1 EXPRESS / PLUS Processor. The strips are to be read within 60 minutes of opening of the processor lid and removal from the tray.