Power meters are used for high-accuracy measurements of power over a wide-frequency bandwidth, and from both AC and DC circuits

DC power supplies accept an input power and output the desired form of DC power.

Analog panel meters measure and display processes and electrical variables with a simple dial display

Energy meters measure the total energy of a single pulse and optical power meters measure the average power of a continuous light beam

Fiber optic power meters are instruments that measure the average power of a continuous light beam.

Power supplies are devices that produce AC or DC power.

KVA meters measure the apparent power of AC devices in kilovolt-amperes (KVA).