Just wanted to post some information about a tool I think every boat owner should have. I bought one of these last weekend and was finally able to locate a raw water hose leak that has puzzeled me for a couple months. It was $149 and works great. It is a little tricky to get started with but after practice, I can see all around the engine and transom assembly. It has better resolution than I thought it would. It is available at Harbor Freight.