Lets suppose these two guys puchased a copy of ASNT SNT-TC-1A or CP 189 before they venture out with their fairly new digital scope?
Lets suppose these two guys just started testing welds or materials, and someone overlooked a discontinuity that cause a failure of a part, which in turn caused a malfunction, or worse yet, an injury or even death?
Lets suppose these two guys ended up in a courtroom trying to explain their required training, experience and documentation?
Smart a%! remarks aside, if your asking these questions, why not make it a threesome and either hire an ASNT Level III, or contract the services of one?