P.N. Zubkov, V.I. Dobrovolskiy, S.V. Kolerskiy, S.S. Kolerskaya

Al’manac of Modern Metrology № 1 (6) 2016, pages 117–123

Instruments for transferring the units of the number density of light air ions – verification facilities – are described. Results of their tests for the purpose of type approval are presented.

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