Computer software for use in network management; computer software for use in database management; computer software for measurement instrument data processing; Electronic and optical communications instruments and components, namely, optical transmitters, optical receivers, optical data links, optical transceiver, cable television transmitters, digital transmitters and communication link testers for testing communication links; electronic instruments for use in remote inspection and measurement of industrial components using remote visual devices; electronic instruments, namely, logic analyzers; electronic integrated circuits; electronic magnetostrictive equipment, namely, a wave generator, wave sensor and wave analyzer; electronic products for the generation, measurement, and analysis of audio signals, namely, audio analyzers; electronic software updates, namely, downloadable computer software and associated data files for the updating of the network test instruments and analyzing network systems, provided via computer and communication networks; electronic test and measurement devices for use in the fields of networks and telecommunications, namely, instrumentation used to test and certify new and existing data and voice communication cable and coaxial cable; electronic test instrument and associated software for use in leak, flow and functional testing; electronic testing equipment, namely, sound level meters; electronic testing equipment, namely, telecommunication line integrity testing apparatus; electronic text-messaging device for use in conjunction with personal digital assistants; encoding and decoding apparatus and instruments; fiber optic instruments, namely, multiplexers, optical spectrum analyzers, and optical power meters; hardened units composed of microprocessors and integrated transmitters and receivers installed in the field and on board both mobile and stationary equipment in large scale mining, construction, and industrial operations to collect data from various applications, to transmit the data to central processing facilities, and to receive data transmissions directed to the applications and equipment; high frequency switches; instruments for measuring length; measuring instrumentation and apparatus, namely, digitizers; resistance measuring instruments; scientific measuring instruments, namely, conductivity meters; telephone apparatus; telephone apparatus and receivers; telephone apparatus, namely, intercoms; tool measuring instruments