Pinpointers
I use the Cen-Tech pinpointer, costs about $20 from Harbor Freight.com. You do not have to touch the coin to get it to sound off, but the range is about a little under to a little over 1". It sounds off on the tip & also the bottom 1" or so of the sides so it does often help me know if I got it out or if it is a little deeper or off to one side.
It seems water resistant, the only place water might get in is around the sensitivity adjustment, pointed down when in hole or you could carry it pointed down or carry in pocket.
I've had mine maybe 2 years & think I might still be on the first battery. I guess the only thing I miss is a vibraration or other silent form of detection. I don't know if I could be charged with a noise violation, or if someone could get nasty & say the noise bothers them. I don't know how far the sound can be heard.
Sure a Sunray probe is better but a huge difference in cost & will add 11oz to a detector that may already be bordering on too heavy. Of course for about $40 one can buy a Swingy Thingy bungee harness if too heavy.
Without even using one I can say the Automax has the disadvantage of being too big to fit in pocket. I've never seen anyone besides Kellyco selling them new, I wonder why?
Yeah, the Garrett may get you a fraction of an inch deeper, besides having an extra feature or two. If that's worth an extra hundred or so to you, go for it.
If you wanted to spend over $150, you could get a Tesoro Treauremate pin-pointer with lifetime warranty. Or for something like $300 the Pocket Uniprobe.
I don't want to tell you what to buy but just offer these tidbits of info to help you decide for yourself. Best wishes, George (MN)