Trust Puritan’s ESK® Environmental Sampling Kit for sporadic surface testing throughout the manufacturing process to detect Listeria and other contaminants. Secure your place on your customer’s table with Puritan’s ESK - assuring you deliver the finest quality possible. ESK is available with four media options (all available in either 4ml or 10ml configurations), each with its own specific use. Learn more about ESK® and Puritan’s line of environmental testing products.