Does anyone know how old this model Surfmaster Amphibian II is and does it work as well as the new water metal dectors by whites. There is one forsale how much would be the most to over for a used on on Ebay.I was wondering if it would be a good side metal detector with my MXT 300. I thought the Surfmaster might be better for travel by are to take to places like Mexcio. Also what coil is best to take I have the 4x6 and 12inch. Thanks for any help.