div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader042vdocumentsusreader042viewer20220309035b433d327f8b9a17568be3a0html5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: Log Book If inaccurate result is suspected calibration should be checked more frequently Follow the procedure for calibration in the Alco-Sensor Manual The Log Book will be retained src=https:reader042vdocumentsusreader042viewer20220309035b433d327f8b9a17568be3a0html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divdiv class=annotationTitlehappydiv div class=annotationSubjectStampdivdiv