Tonight witnessed the building of a field deployable housing for the carbon dioxide monitor that will be installed at Kartchner Caverns. Here is a picture during construction. I used a leatherman (front-center) to cut holes in the plastic housing (center) for the carbon dioxide monitor (left). I also added a picture hook on the back of the housing so it can be hung on a post (screwdriver front-center-right). After I finished cutting holes in the housing, I covered them with the air filter (back-center-left) and glued the filter to the housing with the loctite glue (right).