The differences between the two are like night and day. There's a reason one is 20 dollars and the other is 100 dollars.
First and Foremost, the pointer does NOT have 'Proximity' sound and thus you can't determine the 'depth' of your target 'accurately'. Also, the Garrett Pro will help identify LARGE targets by sounding off before you even hit the bottom of the hole. That's a HUGE bonus on large targets, especially those laying on their side.
Second, the Centech probes have a penchant for 'snapping off' and/or 'Cracking', that of course just can't happen with the Garrett. (I actually use the side of it to shovel dirt back into the hole on occasion.)
Third, the Centech is NOT Moisture barrier friendly, whereas the Garrett is basically 'water-proof' (you can wash it with running water by merely putting your finger over the speaker) and using it in the Rain or Mud is no problem at all.
Finally, UNLESS you do the modifications, the Centech's performance is 'DISMAL' at best. So for those who aren't into taking things apart, this would not be the unit for them.
I think the 'Modified' Centech would be a GREAT backup unit, but I wouldn't use one as my Primary Pin-Pointer.
Just my .02
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