A method of inspecting containers for contamination in a container filling plant, and an arrangement therefor. This can be accomplished by changing the coatings on the OPO material and Q-switch and by elongating the OPO cavity to approximately 2 to 3 times the OPO crystal length. A transparent gel-like resin layer 250 is formed between a rear side of the transparent front plate and a front side of the display panel. A phase shifter is operatively associated with the handle assembly and is operably coupled to the pair of output channels. Another feature includes a standoff feature that reduces tissue damage. Also extending from the center section is an L-shaped guard front flange that includes a first leg joined with the center section and a second leg extending from the first leg.