There are many terms used to describe methods of gathering information about electricity that are relevant to the job at hand; "load", "demand", "kVA", "kW", "apparent" or "real" power, etc. With advancements in today's technology, the data can be interpreted in many different ways. However the present economy demands that jobs be accomplished with the least effort to remain practical. There will always be more technologically advanced devices on the market but do they make the task easier or more complicated? Separating these measuring tools into skill categories helps make the buying decision. Read more here.