I've been wanting a Booz Barometer for one of my locations and all of the ones I was finding were running on a Nickel. I know there are quarter ones out there but I wasn't having luck finding them. There were other reasons I wasn't happy with the original design. The original one opened from the back and sits on a table. I wanted to be able to mount it to a wall. Also, when it was not being used, the lights would turn off and I was afraid people would think that it was turned off/not working. I borrowed an original from a friend and have been using it for measuring.