Eagle FishMark 320 Fish Finder

I am not sure how to test this but it looks to be in good condition. Selling as for parts / non working just in case. Thanks for looking!

Brand: Eagle
Model: FishMark 320
Type: Fish Finder / Depth Sounder
Color: Gray

Keywords: Sonar, Marine Electronics, Angling, Boating Gear, Depth Finder, Nautical, Fishing Tech, Underwater Imaging