Underwater or places near salt water metal detecting offer a fine treat of treasures. But that kind of hunt will need a special type of metal detector and not just any kind of waterproof metal detectors. You see, there are three different types of waterproof metal detectors. These differ on their pulse induction, low frequency and broad band spectrum detectors that are used for underwater hunting.The pulse induction or PI underwater metal detectors are recommended for use in and near salt water. The PI's electronic currents are strong enough to get through the ground minerals. They are not as accurate when it comes to reading, and you may have to go through finding some trash before you locate your sunken treasure. Garret and Headhunter are both brand names that you can count on for a good underwater handheld metal detector. These metal detectors are guaranteed to withstand the salt water and may be submerged in it as well.Very low frequency handheld underwater metal detctors are able to pick out what is trash and what is treasure. Unlike the PI underwater metal detector, the VLF is affected by mineralization in the ground. They have to be adjusted to minimize the effect that minerals have on the handheld detector. Fisher and Headhunter brands are some good names in this category. Broad band spectrum or BBS metal detectors have several frequencies that they transmit as opposed to just one. These kinds provide a greater depth compared to the other types of detectors enthusiasts use. Another advantage about BBS frequencies is that they give greater discrimination with more accuracy. Having said all these, you can definitely choose the right detector suitable for you.If you are still left undecided on what underwater metal detector to buy, consider where you live. Suppose you live near the beach, you'll need a metal detector perfect for salt water. If you plan to go metal detecting by the lake that has fairly a great depth, without thinking twice BBS is most compatible for that. Always consider what is regarded as important before purchasing a metal detector. It's the rationale for your success, happiness and comfort ability in a metal detecting trip. After a few hunting sessions you will definitely know what other things you need for you experience to be more worthwhile and adventurous.