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n.1.An instrument for ascertaining the amount of ozone in the atmosphere, or in any gaseous mixture.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The difference in data of Kaunas Meteorological Station and other investigated countries can be explained as inaccuracy of measuring ozonometer, impact of meteorological conditions on performed measurements, mistakes of a worker performing measurements, and etc.