Abstract
The industrial hygienist has for some time been aware of the possible hazards which exist from the energies in the non-ionizing portion of the electromagnetic spectrum. Potential sources of these radiations and instrumentation available for field measurement are reviewed. The instruments by categorical types, their advantages, disadvantages, and specificity for various portions of the spectrum, as well as the interpretation of their responses are discussed. Field survey techniques for specific sources and/or energies are also presented. The needs are stated for continuing research on instrumentation with recommendations related to spectral response and reliability.