Class 4 steam indicator strip that measures 4"L x 1.25"W x 1.5"H and has a distinctive, non-reversible color change from blue to black. These strips contain latex, and are for use in gravity and vacuum cycles. Sold 250 per box.

3M Comply class 4 steam indicator strip that measures 0.625"W x 4.25"L in short form, which is convenient for smaller packs. Has a distinctive color change from yellow to black and can be used in all steam sterilizers. These strips are latex-free and are for use as an internal pack monitor for 250-270°F processes. Sold 250 per box.