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The dosimeter-radiometer "Expert" was produced since 1988 in professional and domestic performance. Designed to determine the equivalent dose rate of photon (gamma) radiation and beta-radiation flux density from contaminated surfaces in everyday life, at work and in banking. Measuring range of equivalent dose rate, μSv / h 0.1-500. The photon energy range in measuring the dose rate, MeV 0.06-1.25. The main relative error in determining the dose rate,% ± 30. Energy dependence when measuring dose rate,% ± 50. Measurement range of beta-radiation flux density from polluted surfaces by strontium-90, yttrium-90 or cesium-137, ppm. cm2 0.3-500. The lower limit of the energy of the detected beta radiation is MeV 0.156. Power - battery type 6F22. Dimensions, mm - 192x64x40. Weight, kg - 0.3.