You're both helpful on this one and thanks. I mostly wanted something lightweight that would give me an idea of depth. I also did some research and found a pdf online with a 2-page instruction list. Evidently this LPS-1 is a fairly uncomplicated depth finder that you just dip into the water, push the switch and hold to get a depth. The screen displays the depth for 10 seconds after you lift it from the water. Probably just fine for what I need but not as useful as say a PiranhaMax 150 or something similar.

I'll work my way up to a more expensive model probably one of these days but for now this will work. Thanks gents! :thumbup