Founded in 1979, McGrath RentCorp, operating under the trade name Mobile Modular Management Corporation, rents and sells modular buildings to fulfill customer's temporary and permanent space needs in California and Texas. Mobile Modular believes it is the largest provider of relocatable classrooms for rental to school districts for grades K - 12 in California. McGrath RentCorp's majority owned subsidiary, Enviroplex, Inc., manufactures and sells classrooms directly to school districts in California. The Company's RenTelco division rents and sells electronic test equipment and is recognized as the leader in communications and fiber-optic test equipment rentals throughout the U.S.