Underwriters Laboratories (UL) tests products for public safety and has developed more than 1,000 "Standards for Safety".
UL 1604 certification allows products to be used in potentially explosive environments found in oil and gas, petrochemical, aviation and other industries. Fully-rugged and ultra-mobile-rugged Toughbook® mobile computers can be configured to provide safe, reliable mobile computing solutions for spark-free use. UL 1604-approved versions of fully-rugged Toughbook models are available for use in Class I, Division 2, Groups A, B, C and D environments. These are defined as places where flammable gases, vapors and liquids are present during abnormal or accident conditions.