Beach Detecting is a different ball game to dry land detecting.  Beach detecting is where pulse detectors come into their own. Most manufacturers make a pulse detector.  The main pulse manufacturer is Pulse Power. They have been making pulse detectors for as long as I can remember - Beachscan, several models of Goldscan, Gold Quests, and their latest I think is the Deepscan. Some models you can only use hip or chest mounted, others are stem mounted. One thing is certain, they all go deep. 
I have used 3 pulse detectors over the years.  My first was the Widescan in the early 70's.  My next was the Whites Surfmaster PI which I used with some success for searching in shallow water at low tide. My third was the C-Scope CS6PI, which I used for basic beach detecting.
I never really took to searching in water, though many have and with good results. I had a few nice finds with both the Surfmaster and the CS6PI, but I found the deep digging for small iron targets
detected by pulse detectors too much.  If you want to make good finds on the beach, you have to dig deep, but as there is no Discrim on pulse detectors, you also have to be prepared to dig your share of small iron targets.  You can turn the pulse rate up, but this defeats the purpose because you lose sensitivity and depth, and a lot of good finds at the same time.  Finds can be made on the beach with a pulse detector, even if the conditions are not favorable, because of their ability to go deep.  Unlike the VLF motion detector, they can punch through loose sand, down to the hard packed, or black sand, that holds the finds you are looking for.  If you use a VLF motion discriminating detector on the beach, you will not have to dig the deep iron targets as they do not reach as deep, but then you will not make good deep finds either.