Data processing apparatus; computer peripheral devices; recorded computer software for electronic measuring instruments, namely, digital oscilloscope, digital multimeter, spectrum analyzer, arbitrary waveform generator, radio frequency signal generations; downloadable computer programs for electronic measuring instruments, namely, digital oscilloscope, digital multimeter, spectrum analyzer, arbitrary waveform generator, radio frequency signal generations; scientific measuring instruments, namely, conductivity meters; oscillographs; electrical components in the nature of electric contactors for use in electronic measuring instruments; dynamometers; measuring apparatus, namely, clamp meters for measuring electricity; frequency meters; voltmeters; galvanometers; resistance measuring instruments; electronic instruments, namely, logic analyzers; spectrum analyzer; surveying machines and instruments; voltage stabilizers for use in electrical measurements; low voltage stabilizing power supply; stabilized voltage power supply