A hot melt adhesive composition comprising a) from about 5 wt-% to about 50 wt-% of at least one homogeneous linear or substantially linear ethylenealpha-olefin interpolymer characterized as having a density from 0. The disclosed embodiments use a single digital imager having a single focal plane array sensor to sense data in both the image-based and laser-based modes of operation. A recoil reducer is receivable in the first and second stock cavities. The device can be installed around existing piping or inserted in the pipe line by pipe fittings.