Years ago, Dad was a school bus mechanic. He had a little wireless amp gauge that you could just hold close to the posts on a generator and it would read amperage. Anybody ever seen one or know what I'm talking about? It was about the size of a little travel alarm clock. It had a chrome back and a brown face that just has a simple amp gauge in it.I searched Google and can't find anything even similar. I haven't been in his garage in years, can't even get to the work bench for all the junk to see if he had it or not. Might have belonged to the school and he didn't get it when he brought his tools home.