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The dos "Grach" (DKG-03D) has been produced since 1999. Designed to measure the power of the ambient dose equivalent H * (10) gamma radiation; measurement of the ambient dose equivalent H * (10) gamma radiation (operator dose). Highly sensitive dosimeter, convenient for carrying out radiation surveys. The result of measurement and its error are displayed continuously from the moment of the beginning of measurements and are constantly updated. Thanks to sound signals with a frequency proportional to the dose rate, the device is also convenient for assessing the radiation environment. Properties: independent restart of dose and dose rate measurement; continuous measurement with constant refinement of the result; assessment of the radiation situation by loud sound signals (clicks), the frequency of which is proportional to the dose rate; measurement result with any necessary statistical error; fast automatic restart of the device when the dose rate changes by more than 3.4; indication of a statistical error during the whole measurement; indication of the unit of measurement; backlight; pocket size; high sensitivity; the ability to work with the headset. Technical characteristics: Measurement range: dose rates H * (10) 0.1 μSv / h 1.0 mSv / h doses H * (10) 1.0 μSv 100 Sv. The energy range of gamma radiation, 0.05 3.0 MeV. The limits of permissible measurement error are ± 15 2.5 / H * (10)%, where H * (10) is the measured value, µSv / h (µSv). Sensitivity 20,000 pulses / µSv. The energy dependence of the sensitivity (relative to the effective energy of 0.662 keV) is no more than 25%. The time to enter the operating mode 5 seconds. Power supply 2 AA elements. Working time with a set of batteries 200 hours. Device weight 0.2 kg.