“…That is why the market of metrological service constitutes a considerable share of GDP in developed countries [7], [8]. The progress of instruments and instrumentation lies in standardization [9], error elimination techniques [10] and increasing metrological reliability of measurement results [11], developing new metrological techniques [12], [13], developing new verification and calibrating techniques, including calibration in-situ [14]- [16]. This progress is called for, because proper measurement instruments and sensors lead to considerable gain in ecology [17], [18], economy [18], science [19], medicine [20] and other areas, therefore studies in the field of metrological service are relevant and topical [11], [15].…”