Review · By Metal Detector Nerd · August 4, 2026
Garrett Ace 400 Review
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The Garrett Ace 400 is a 10 kHz single-frequency detector that finds coins and relics on day one with almost no setup — and it's still the detector I hand a beginner who wants to be digging this weekend, not next month. Short version: the best turn-on-and-go first machine under the mid-range, as long as you don't need to put it underwater.
It's not the deepest or the most modern detector on this site. It is the one that gets the most people into the hobby and keeps them there, which counts for a lot.
The verdict
The most forgiving first detector you can buy. It finds real targets immediately and teaches you the numbers that every fancier machine also uses.
01Specs that actually matter in the field
One operating frequency, tuned in the sweet spot for coins, jewelry, and relics. Single-frequency machines struggle on wet salt sand — but on dirt, 10 kHz is a genuinely good all-purpose choice, not a compromise.
Every hit gets a number, so you build a mental map — foil down low, pull tabs in the middle, quarters up high. This is the single skill that turns random digging into productive digging, and the Ace teaches it well.
Lets you hear the iron you've told the detector to ignore. Sounds backwards, but it's how you spot a good coin sitting next to a nail instead of walking past the whole signal. Genuinely useful in old parks.
A DD coil sends a blade-shaped detection field instead of a cone, which handles mineralized ground better and pinpoints more precisely. It's a good stock coil — a real one, not a token one.
Ground balance is the detector tuning out mineralized soil. The Ace's is fixed at the factory rather than adjustable, which is one less thing to learn — and one less thing you can fix when the ground gets nasty.
Heavier than it looks on paper, and heavier than most machines above it. After two hours you'll notice. A cheap harness or just switching arms handles it, but it's the honest weak point.
02Who it's for (and who it's not)
Buy it if this is your first detector and your ground is dirt — parks, sports fields, old homesteads, farm edges. It arrives, you assemble it in ten minutes, you turn it on, and you find things. That's not a small feature; a machine that frustrates a beginner is a machine that ends up in a closet.
Don't buy it for the beach. A single-frequency VLF on wet salt sand chatters and falses badly, and the control box isn't waterproof anyway. If there's saltwater in your plans, start at the Nokta Simplex+ instead — it's waterproof top to bottom for similar money.
03The honest scorecard
+What's great
- Genuinely turn-on-and-go. No ground balancing, no menu diving, no setup ritual before you can swing.
- The digital target ID is accurate enough to trust, and learning it transfers directly to every machine you'll ever own after this one.
- Iron Audio is a real feature, not a bullet point — it's how you pull good coins out of nail-infested old sites.
- Comes as a complete kit with headphones and a coil cover, so there's no second shopping trip before you can hunt.
- Garrett's support and parts availability in the US are the best in the business.
–What's not
- 5.5 lbs is heavy for its class, and the balance is nose-forward. Long hunts want a harness.
- Control box is not waterproof — the coil is submersible, the rest very much isn't. Rain covers are a real purchase, not paranoia.
- No adjustable ground balance, so in heavily mineralized red-clay soil you're stuck with whatever the factory decided.
- Single frequency means wet salt sand is effectively off the menu.
- The design is over a decade old at this point. It works, but you're not getting modern niceties like wireless audio or a rechargeable pack.
04How it stacks up
Is the big jump in price actually worth it for a beginner?
Garrett Ace 400 vs Minelab Equinox 800The two best beginner machines, compared straight up.
Nokta Simplex+ vs Garrett Ace 400See where the Ace 400 lands against the whole starter field.
Best metal detector for beginnersThe rest of the Garrett lineup, ranked.
Garrett brand hub
05FAQ
- Is the Garrett Ace 400 waterproof?
- No — only the coil is submersible. The control box is not waterproof and shouldn't be rained on without a cover. If you want a fully waterproof machine at a similar price, look at the Nokta Simplex+.
- Is the Ace 400 good for beginners?
- Yes, it's one of the best beginner detectors you can buy. There's no ground balancing to learn and no menu to get lost in — you assemble it, switch it on, and start reading target IDs, which is the skill that matters most early on.
- What's the difference between the Ace 300 and 400?
- The 400 adds Iron Audio, adjustable frequency to dodge electrical interference, a slightly higher operating frequency, and a bigger coil. If old, nail-heavy sites are in your plans, the 400 is worth the gap; for open fields the 300 does most of the same work.
- How deep does the Garrett Ace 400 go?
- Figure 6–8 inches on a coin in average soil, deeper on larger objects. Depth is dominated by soil mineralization and target size rather than by the machine, so treat any fixed number — including this one — as a rough guide.
Bottom line
The Garrett Ace 400 is the detector I recommend when someone wants to actually start this weekend. It's not the deepest machine here and it's not modern, but it's forgiving, complete in the box, and it finds real targets without a learning curve standing in the way.
If your hunting includes any saltwater or wet sand, skip it and start at the Nokta Simplex+. For dirt hunting on a beginner budget, this is still the safe answer.