electronic test and measurement instruments in the nature of analyzers, namely, spectrum, vector, signal, network, power and power source, protocol, radio frequency, microwave, logic, modulation-domain, optical component, light wave component, optical modulation, time-interval, polarization, and photonic dispersion and loss analyzers; electronic test and measurement instruments, namely, electric meters, inductance meters, capacitance meters, resistance meters, impedance meters, testing meters...