LOL - Thanks Ship but there was a hint of sarcasm in regards to the t-shirt,
although I genuinely did think that the info was a good beginning point and I have given a copy to the other guys on my crew. One recently mixed up Neutral and Earth when repairing some power leads with me. Fortunately I check all work before I put it back into circulation and all our plugs and in-line sockets are clear now, so you can very easily do an eyeball check, give them the once over with the Mega and away you go!