Testing of the goods and services of others for the purposes of certification in the fields of sound recording, sound reproduction, electrical and electromagnetic signal transmitting, amplifying, receiving, and converting devices, namely, cables, wires, connectors, and control devices for use with electrical, electronic, and computer devices, loudspeakers, stereo amplifiers, computer components and accessories, audio equipment and accessories, TV displays, video displays, projectors, video equipment and accessories, data storage, archival and retrieval devices, electronic game equipment and accessories, electrical power control components and accessories, and energy conditioning devices