I've got a 40 year old MGB (old British Sports Car) and electrics are the bain of my life.This gives me quick, easy, and simple diagnosis.The LCD readout is good but then being able to supply power or ground at flick of a switch as well as create a load (via inbuilt breaker) is great.Seem my review and more comments here :-http://diary-of-mgb.blogspot.com/2011/01/power-probe-iii-aka-light-sabre.htmlCheers,Richard B.