The Pro4 is is reviewed by industry professionals on Geo-matching. Take a look for yourself and join the discussion!
"We use it as a tool to understand what kind of trash we have sitting on the bottom of our urban harbors, to pick up that trash and as an education tool to connect people to their underwater world. We find the Pro 4 incredibly reliable…."
http://www.geo-matching.com/products/id1949-pro-4.html#review75659
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