The AT Pro is great, it can be used about anywhere. No need to worry about rain or spray from water, can go underwater to 10'. It can ground balance to wet salt sand or seawater. With the sensitivity turned down a bit on salt, it may still detect coins to 8". The $595 price is the lowest they can list online, but a dealer may quote a lower price on the phone or in e-mail.
If you can't go to $500 or so, there is a new model by Teknetics called the Eurotek Pro. It comes with a 8" concentric coil for $219, or with an 11" double D coil for $299 (the DD better in most areas). The online manual says new proprietary circuit allows it to be used in iron ground without needing a ground balance control, & that it may get accuare IDs to 8" & reads depth to 9" in non-motion pinpoint. Has a large numeric ID # indicating conductivity, so one can have a pretty good idea if it's a coin. Gets coins close to trash, & iron response can be adjusted for volume relative to coins, or off where it just flashes on iron.
Manual on website tekneticst2.com/ IIRC. You may need to contact the mfr to ask if it works on a saltwater beach. If not, you'd probably need to get a more expensive mode. It isn't waterproof & saltwater getting in a land detector would be a disaster, so it would at least need a cover for the control box. Might be a few videos of this on You Tube.
The AT Pro is a use anywhere detector, except not in water over 10 feet deep. Lots of gold jewelry has been found in shallow water, but often gets found quickly by one detectorist or another. Best wishes, George (MN)
