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I can only speak to the one I have The Hummingbird Piranha Max 215 It has performed well for 3 years with no issues at all, and no corrosion at the terminals.
I use dielectric grease on the connections each time I go fishing. It gives decent readings on fish to 200 ft. and works very good marking bait fish.
It also runs on 8 rechargeable AA batteries for a long time (a couple of outings) 800 watts verses 1600+ for most other units.
IMO -- Epoxy on the transducer is the better way to go. I have also tried Goop and the picture was not as good.
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I have wanted to try a better high end FF unit and might purchase one this year, but this $89 Fish Finder has worked just fine so I leave well enough alone.
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