up for auction is this Standard  DST50 Depth Transducer. The DST50 is a nylon, low-profile transducer that can be used on sailboats and powerboats with a dead rise of 10° or less. The box was sealed shut when I purchased it from an estate sale. It does not appear to have ever been used. All of my listings come from estate sales. I try to be as accurate and transparent as possible.  Feel free to ask questions.