Casella CEL offers its TUFF™ line of personal air sampling pumps that feature a sealed case with over-molding that protects it from damaging moisture, extreme temperatures, solvents, and impact. With a flow range from 5 ml/min to 4.5 l/min, Casella TUFF pumps are ideal for a wide range of occupational health and safety applications from simple abatement sampling to more specialized industrial hygiene monitoring of dusts, fumes and gases. Casella CEL Inc.,, (800) 366-2966. Booth 2925. Circle 334