div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Adobe Photoshop PDF · ACCUREF Copper I Copper Sulfate Permanent Reference Electrode FEATURES Electrodes are buried directly with native soil backfill — no need for src=https:reader035vdocumentsusreader035viewer20220712196056c00faf3e033ed27c79a9html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv