McGrath RentCorp, a diversified business to business rental company, engages in the rental and sale of relocatable modular buildings, electronic test equipment, and liquid and solid containment tanks and boxes primarily in the United States and Canada. It operates in four segments: Mobile Modular, TRS-RenTelco, Adler Tanks, and Enviroplex. The Mobile Modular segment rents modular buildings designed for use as classrooms, temporary offices adjacent to existing facilities, sales offices, construction field offices, restroom buildings, health care clinics, child care facilities, and office space; and portable storage containers. The TRS-RenTelco segment rents and sells general purpose electronic test equipment, including oscilloscopes, amplifiers, analyzers, signal source, and power source test equipment for aerospace, defense, electronics, industrial, research, and semiconductor industries. This segment also provides communications test equipment comprising network and transmission test equipment for various fiber, copper, and wireless networks to manufacturers of communications equipment and products, electrical and communications installation contractors, field technicians, and service providers. The Adler Tanks segment rents tanks and boxes, such as fixed axle steel tanks, vacuum containers, dewatering boxes, and roll-off and trash boxes for various containment solutions to store hazardous and non-hazardous liquids and solids used in oil and gas exploration and field services, refinery, chemical and industrial plant maintenance, environmental remediation and field services, infrastructure building construction, marine, pipeline construction and maintenance, tank terminals, wastewater treatment, and waste management and landfill service applications. The Enviroplex segment manufactures and sells portable classrooms to public school districts and other educational institutions in California. McGrath RentCorp was founded in 1979 and is based in Livermore, California.