div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: NSI 3000 Home Comfort Report - Holt Plumbing …The NSI 3000TM low-level monitor senses CO levels as low as 5 ppm parts per million Infants chil- dren elderly and people src=https:reader033fdocumentsnetreader033viewer20220604165f140b0413b99344a66bc7ebhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: NSI 3000 Home Comfort Report - Holt Plumbing …The NSI 3000TM low-level monitor senses CO levels as low as 5 ppm parts per million Infants chil- dren elderly and people src=https:reader033fdocumentsnetreader033viewer20220604165f140b0413b99344a66bc7ebhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdiv