Amprobe Model R5 (Walkley/Russelll road)

This is a tool for an Industrial Electrician. It is a clamp-on meter with three voltage scales from 0 to 600. Four Amp scales from 0 to 300. Tell me what I x R equals. What E over R equals. What E over I equals. What I squared x R equals. What E x I equals. I would like the recipient to be someone who will use it in their employment.