A second bubble element is mounted in the central region of the level housing, and {TAIL ~ the bubble element} is parallel to {HEAD ~ the length} of the housing 
A second bubble element is mounted in the central region of the level housing , and { TAIL ~ the bubble element } is parallel to { HEAD ~ the length } of the housing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH