If you’re diving in to underwater metal detecting, then you need a waterproof metal detector! Here are some things to consider before you settle on a model.
First, you need to know the difference between the three main types of waterproof metal detectors.
Pulse Induction (PI) metal detectors are great for diving and salt water beaches, since they are not affected by ground minerals or wet salt sand. They use rapid electronic pulses, are deep seeking and are very sensitive to precious metals although not very discriminatory between them and junk items.
Very Low Frequency (VLF) metal detectors discriminate better than PI detectors and are great for finding coins, relics and jewelery. They are affected by ground minerals but most have controls to overcome this.
Broad Band Spectrum (BBS) detectors use simultaneous, multiple frequency signals and are very sensitive overall.
Where will you be treasure hunting? All of these types of waterproof metal detectors will work in and around fresh water, but for salt water you will want either a PI or a BBS detector.
If you will be diving, make sure you get a waterproof detector that is rated for the depths that you intend to dive. Better to get one rated for deeper depths than you think you will need. Also, make sure it has a short dive pole, so it is more comfortable to use while snorkeling or diving.
You will also want to get some accessories that will make your overall water hunting easier and more convenient. A carry bag offers protection, and makes it easy to grab and go whenever you want. For beach hunting, a trowel and sand scoop are essential. make sure to get a sifter scoop for easier sifting through layers of sand. headphones are another must-have. Most waterproof metal detectors come with waterproof headphones, but it is always good to have extra.
When you’re buying your waterproof detector, let the seller know what kinds of targets you will be looking for and where you will be doing your hunting. They will be able to advise you in deeper detail about features and functions you may want to have, and give you some first-hand field experience with several different models. So before you dive in, do your research and know what you need, and what you don’t. Then you will get a detector that will bring you hours of fun, and hopefully some good treasure!