FIELD: measuring technology. SUBSTANCE: method may be used in control systems of production processes. Method is based on use of characteristics of electromagnetic waves interacting with medium being checked. Method includes probing of anisotropic liquid by electromagnetic oscillations, separation of two orthogonally-polarized waves from wave passed through liquid being checked, and determination of phase different between the polarized waves proportional to liquid level in reservoir. EFFECT: higher accuracy of measurement. 1 dwg
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