div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: · # Uncertanity of measurement is at 95% confidence levelk = 2 for veff30 or as per NABL-141 src=https:reader031vdocumentssitereader031viewer20220131205ad6c5a27f8b9a98098bf5fchtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv