STERIS Temp-A-Sure? Chemical Indicator Strips are self-adhesive temperature recording labels that can be read at a glance. They can be used at the beginning of the day or each shift change to confirm the operation temperature of the washer. Position the Temp-A-Sure Chemical Indicators inside washing equipment to verify the temperature of your washer. Four windows (160 _F/70_C, 170 _F/77 _C, 180 _F/83 _C, and 190 _F/88 _C) will turn to a solid black dot when that temperature is achieved in the washer.