PSI, Inc. (Professional Scuba Inspectors), also now known as PCI, Inc. (Professional Cylinder Inspectors, Inc.) or together as PSI-PCI, was formed in 1982. Affiliate cylinder inspector instructors are located in more than 10 countries. Hundreds of hands-on visual inspector courses, training thousands of students, are conducted each year. Training by correspondence is offered to technicians at international locations not served by PSI-PCI instructors.