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The household meter "Master-1" was produced from I quarter of 1990 by several enterprises of the country, particularly in Vladivostok, Minsk, Kiev and some others. Designed for use by the public in order to monitor the radiation situation on the ground, in work and residential areas. The device measures the equivalent dose rate of gamma radiation in the range from 0.1 to 9.99 μSv / h (micro Sievert / hour). Photos of Maxim, with online auctions and forums.