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Inexpensive Microwave Survey Instruments: An Evaluation

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William A. Herman, Donald M. Witters, Jr. · 1979

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Consumer EMF meters can give dangerously inaccurate readings, potentially missing real hazards or creating false alarms.

Plain English Summary

Summary written for general audiences

This 1979 Bureau of Radiological Health study evaluated the accuracy of inexpensive microwave detection instruments that consumers and repair shops were starting to use to test microwave oven emissions. The researchers found these cheaper devices could give unreliable readings, potentially missing real hazards or triggering unnecessary repairs.

Why This Matters

This study highlights a fundamental challenge that persists today in EMF measurement: the reliability gap between professional-grade instruments and consumer devices. While the focus was on microwave ovens in 1979, the same principle applies to modern EMF meters that people use to measure wireless radiation from cell phones, WiFi routers, and smart meters. The reality is that accurate EMF measurement requires precision instruments and proper technique. Inexpensive meters can provide false reassurance when readings are erroneously low, or create unnecessary anxiety when readings are erroneously high. What this means for you: if you're concerned about EMF exposure levels in your home, understand that consumer-grade meters have significant limitations. The science demonstrates that professional measurement requires calibrated equipment and expertise that most consumer devices simply cannot provide.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
William A. Herman, Donald M. Witters, Jr. (1979). Inexpensive Microwave Survey Instruments: An Evaluation.
Show BibTeX
@article{inexpensive_microwave_survey_instruments_an_evaluation_g4462,
  author = {William A. Herman and Donald M. Witters and Jr.},
  title = {Inexpensive Microwave Survey Instruments: An Evaluation},
  year = {1979},
  
  
}

Quick Questions About This Study

The Bureau of Radiological Health found these cheaper instruments could give unreliable readings that either missed actual microwave leaks (creating safety risks) or showed false high readings (leading to unnecessary expensive repairs).
This 1968 federal law gave the Bureau of Radiological Health responsibility for developing and assessing methods to measure radiation from electronic products like microwave ovens and other consumer devices.
Yes, researchers solicited comments from the manufacturers of these inexpensive microwave detection instruments and incorporated their responses into the final report, though specific manufacturer feedback details weren't provided.
When inexpensive meters show falsely elevated readings, consumers may unnecessarily call repair technicians for their microwave ovens, incurring expense for problems that don't actually exist.
The Bureau had already evaluated precise, sophisticated instruments used for regulatory measurement of microwave oven emissions. These consumer devices were simpler, less expensive, but also significantly less precise and reliable.