A cooling apparatus for a printed circuit board assembly is disclosed. The composition includes isolated Bacillus cereus which are able to reduce a number of well known pathogenic bacterium from aquatic environments. The replica may be made of epoxy, which is cured\u2014for example UV cured\u2014while the replication tool is still in place. The handle has a gripping surface which helps to hold the knife safety apparatus. Multiple channels may be selected, with their signals combined.