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A new method of vibrating string is proposed for measuring the electric component of electromagnetic field. Actually, it is a variation of small probe method, used widely for analyzing the field distribution in cavities. A thin steel string (dstrLtlambda, LstrGtlambda) is used as a probe. The signal scattered is proportional to the field at the string position. The string oscillations play two roles: they move the probe in the field and they allow to distinguish the useful signal from reflections from static environment. Reliability and applicability of the method have been proved in the control measurements using the object with known field distribution.