Neutron beam lines are mostly horizonal, with some exceptions at specialized reactors as the McClellan reactor (Sacramento, USA) that is built underground and has inclined beams, or the small reactor at Kingston college, Canada. These inclined beam lines have never been used to examine thin liquids with at least a vertical beam component. We have built and tested a new device with one or two crystal reflections on pyrolytic graphite to deflect a horizontal neutron beam to the vertical, and examined thin liquids. Initial tests were performed at the TRIGA reactor of Atominstitut Vienna (ATI). Further measurements were conducted at ILL Grenoble, France. Air bubbles in a horizontal CPU water cooler were examined in real time.