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The Signal dosimeter (DRGB-01) was produced presumably since 1992 by NPO DALS, St. Petersburg. It is designed to estimate the dose rate of gamma radiation directly from a digital liquid crystal display panel. The device does not calculate the accumulated radiation dose and is in fact a radiometer. Measurement range capacities from 10 to 10000 μR / h. The error is about 30%. The waiting time for the indication is 5 seconds, the dimensions of the device are 156x78x30.5 mm, the weight is about 200 grams.