Passport Plus Mail-In System 12/Bx by SPS Medical SKU 913-1553AA 123 $131.99 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Passport Plus Sterilizer Monitoring, Read-out Mail-in Biological Indicator system, for all Steam Sterilization Cycles, 24 hour Biological Read-out for all Steam Cycles, box of 12.