This is the only one I have, I was in a hurry to get this one as it was. As you can see in the background how dry it is around here, we burned piles within 300 feet of that sage and scrub brush. Didn't start a fire and we're completely done with the project. We finally got our laser system last week. It's a Trimble Spectra LL300 sending unit with a CR600 machine mounted/grade rod mounted reciever, pretty cool stuff.