Perritt Laboratories We are an independent cGMP laboratory providing testing and consulting services for pharmaceutical and consumer product companies. Founded in 1973, the Company internationally accredited to perform microbiological and child-resistant packaging testing. Microbiological testing detects product contamination (bioburden, MLT), develops & validates test methods, evaluates preservative efficacy (AET), monitors controlled environments (air & surfaces), and tests purified water systems (Conductivity, Bacterial Endotoxins, micro and TOC).