I love a good instrument! However, I have found that the money spent on some instruments (ie gadgets, gizmos, and the like) is much better spent on a certificate of credentials (ie ICC; Residential Electrical Inspector, Commercial Electrical Inspector, and/or Certified Electrical Code Official). This will and has quickly put the Inspectors into "time out". I (in 16 years) have yet to meet a Real Estate Home Inspector of whom, was an Electrical Engineer or Licensed Master Electrician journeyman electrician, residential wireman or even an apprentice electrician. I have counter inspected many home insections and assisted them in understanding what they really meant to say. Embarrasing enough, I have had an inspection (or two) wherein my electrical inspector has said, "I'll go ahead and leave a green card cause I know you'll correct the problem". I (and others) have too much to lose if I dont.
Vango
Electrical Contractor
Master Licensed Electrician
ICC Certified:
Residential Electrical Inspector
Commercial Electrical Inspector
(and I still shock the snot outta myself on occasion, literally)