Power measurement instruments are specialized measuring devices designed to accurately measure and monitor power consumption, power quality, and energy efficiency in manufacturing environments. They measure electrical power parameters including active power, reactive power, apparent power, power factor, frequency, and harmonics to provide detailed analysis of power usage in manufacturing equipment. This category includes clamp-type power meters, stationary power meters, portable power meters, power quality analyzers, and demand monitoring devices, which are essential for energy conservation measures, equipment diagnostics, and power contract optimization. Unlike simple voltage and current measuring instruments, these are specialized device groups that professionally measure the complex physical quantity of electrical power, directly contributing to energy management and production cost reduction in manufacturing industries.