Econo Mail-In Sterilizer Monit or Service 52/Bx by SPS Medical SKU 913-1552AA 123 $191.99 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out Economy Mail-In Monitoring Service - Certified for use in Steam, EO gas, Dry heat and Chemical vapor processes - 52 Tests/Box.