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The household dosimeter "Fon" (DBGB-01U) was produced presumably since 1988 by the Lvovpribor software. The device is designed to track changes in the radioactive environment in time and space; estimates of the safe distance to the radiation source; detection of a local radiation source. The device produces a warning sound and light signal, indicating the digital value on the LCD display. Measurement range of DER, μSv / h - 0.01-99.99. The energy range of MeV is 0.06-1.25. The weight of the device is about 300 grams. Dimensions 145h85h32 mm. Power battery type "Krona". The time of continuous operation from one battery is at least 200 hours.