Differences

from reading descriptions all I see is bigger coil on the 350...might more but do not find anything else by the readings on them.
 

The 250 has a lower frequency 6.5 kHz versus the 350 which has a frequency of 8.25 kHz. The lower frequencies tends to be more sensitive to highly conductive metals such as silver and brass. Plus lower frequencies are better at detecting larger targets which are deeper in the ground. But your higher frequencies tend to find smaller targets such as thin coins and gold nuggets. And as pointed out above, the 350 comes with a larger coil.
 

More notch discrimination is another difference.
 

350 has more iron discrimination and a better coil in my opinion. Between the two I would get the 350. I owned the 350 and found great stuff. It loves coins. My oldest being a 1893 o mint mark barber dime worth around $100.
 

I've had both, its basically frequency, coil, amount of discrimination. I didn't think there was that much difference performance wise in the two. Performance is obtained from understanding your equipment and how it works. if your looking for an upgrade go higher. (ATP) If you have a 250 add the DD coil. If you can afford the 350, I'd go that route. The DD coils makes a huge difference on the ACE units because there's no ground balance and the DD coil is better in bad ground.
 

The 250 Is better for coin hunting and the 350 is better for relics hunting. Don't be fooled by the high number and higher price meaning its overall better, they are 2 different things. If you are wanting to primary hunt coins get the 250 probably a nice used one and get a double d coil after you get a pinpointer. If you are wanting to hunt relics buy the 350 . Here is the reasonings.

Both machines have 12 sections of ID/discrimination. The 350 has 4 segments for iron where the 250 only has one. That is the reason the 350 is better for relics because you have better discrimination of targets containing iron.

The 250 has 7 segments IDed as different possible coins. Where the 350 only has 5 dedicated to coins. And only

Just think about it like this. They both detect the same way they just divide the 12 segments of ID 2 different ways. 250 bunching all the iron together and better dividing higher conductive targets such as coins while the 350 divides iron targets better but combining some of the higher conductive targets together. So you should decide which machine you want based on what you want to hunt the most

garrett_ace_350_panel.gif



1139070_ace_250_control_panel_lg.jpg

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The DD coil is nicer then the standard coil on the 250. I have two DD coils for mine but don't make that the deciding factor because you can always change that but you can't change the ID patterns. I got my DD coil used from a dealer here for around $80 so not that big of a deal.
 

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