Signal Generators are used in various industries to create signals that simulate behavior of system. Frequency Counters are instruments for measuring frequency
Multimeters are the instrument of choice when you need to measure voltage, current, or resistance
Spectrum Analyzers measure signal amplitude vs. frequency. RF Field Strength Meters measure RF levels and electric field strength.
The measurement of power and power quality includes basic parameters of voltage, current, watts (kW, VA, VAR) or energy (kVAh, VARh, kWh)