Extensive Use Of Copper In The CO2 Sample Port, Heated CO2 Feed Line, Housing Of The Patented HEPA Filtration System, And Humidity Pan With Copper SL Decontamination Token, Adds Reassurance That Foreign Microbes Will Not Affect Test Results. Cleanup Is A Breeze With The All Stainless Steel Chamber, And Autoclavable Door Gasket. Optional Copper Shelves Are Available For Even More Contamination Control.