Priceless tool
This instrument has singlehandedly helped me to catch a heck of a lot more salmon. I drop this down and find the magical 50 degree mark and begin trolling above and below this temp. This is an invaluable tool that helps you to reduce a 70 mile X 30 mile lake (Michigan) to a much smaller water by zeroing in your fishing around the temp's. BRAVO FishHawk.