Instrumentation, software, and other tools available for
measuring and monitoring power quality (PQ) continue to follow
the curve found in consumer electronic products—“more for less.”
The capabilities in a $3,000 PQ monitor equal or surpass those
of the $15,000 analyzers that were available just five years
ago. Advances in technology and the global economy have given PQ
tool users a more powerful set of instrumentation options.
Although some people categorize PQ instrumentation by handheld,
portable, and permanently installed equipment, the usage of the
equipment is a better way to look at the commonality among the
troubleshooting and continual-monitoring PQ tools.
Troubleshooting tools come in a multitude of sizes, functions,
and prices. Some of the more recognized companies providing such
equipment include AEMC, AVO, Dranetz-BMI, Fluke, Hioki, Summit
Technology, and Yokagawa.  Multimeters, once used for just
single measurements, have improved accuracy, multiple-reading
memory, and software programs for