Will repost this for posterity.. And BTW, its debatable whether you really want much more than 2 inches to alert for a coin sized object.
Reason being that your pinpointing from the detector should get you fairly close, certainly closer than 4 inches.
The pinpointer lets you know when your getting close to a small metal object [hopefully a coin or ring] ,,, And if it alerted you at 5 inches, that wouldn't be telling you a whole lot. If you can't pinpoint with your detector within 4 inches, you need t work on that 1st.
2 inches alert, then you know you are very close, and had better dig carefully.
Heres the pinpointer I use
Great little unit, had it through some fairly rough field work going on 3 years, still going strong.
Very well made, runs forever on a 9 volt, adjustable sensitivity and a built in LED light that comes in handy
for lighting dark holes.
Audio & visual alert - No vibration though.
Lightweight and small, not much bigger than a deck of cards.
Some may view its snubby little nose as a down side, I like it, because the one I used before, Wizard vibe probe [shaped like a gun] ,,, Was a great unit, loved it ,,, But its long PVC neck snapped at the drop of the hat.
I went through 3 of them in less than 2 years before giving up and trying this.
Love it, and have no need to try anything else.
Only thing that I didn't like about it was that there is no way to clip it on to anything.
I use one of those retractable key chains when hunting, just clip it on a pocket.
So I installed a little screw in O ring screw right in the corner, works like a charm.
I would highly advise anyone to consider this before buying one for 2 or 3 X the price, and are not even as good as this one.
Fairly priced, in my opinion, at around $50 shipped, these are only available from Europe.
Mine took less than 1 week to arrive.
Don't mean to sound like a Sherlock salesman here, or steal any thunder from local forum sponsors, none of whom carry this unit - But I was sold on this little baby a long time ago, and am passing on my high opinion of this great little gadget.
http://tinyurl.com/moox7q
BTW, "Harbor Freight" & "works pretty good" are almost always oxymorons, as you are probably aware.