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Wireless field instruments are naturally digital devices, and as such possess all the innate advantages of digital instrumentation: self-diagnostics, multivariable reporting, duplex communication, etc. Furthermore, wireless instruments (at least in theory) lack some of the ma jor limitations of wired digital instruments: slow data rates, low node counts, and energy limitations for classified areas. The single most significant weakness of current wireless field instrument technology appears to be power. With chemical batteries being the only power source, data update times must be limited to a snail’s pace in order to conserve battery life. With the ongoing development of “energy harvesting” devices to locally power wireless field instruments, we may very well see this technology leap ahead of fieldbus and wired-HART instruments.