Recommended for determining the efficiency of sanitization of containers, equipment surfaces, water miscible, cosmetics, etc.. It can also be used to . Lecithin and polysorbate 80 neutralizes quaternary ammonium compounds and parahydroxy benzoates. Sodium thiosulphate neutralizes mercurial, halogens, aldehydes etc. Histidine acts as a reducing agent. The plates are gamma irradiated and triple packed. Available in scored plate for environmental monitoring, sterility checks by touch or contact method. Grids for easy counting.