I am holding a Sekonic L-508 light meter. Tool of the trade you say. Sure, but it is a great gadget. I purchased it used from a photographer in Missoula. It was well used. So much I had to re-label the controls on the front. Some of my cameras do not even have light meters so it is handy to have around. While it won't open a can of soup, It can read the light falling on the can. from across the room if necessary.