Garrett ACE 400Complete Review & Field Test 2026
Coil-only waterproof (Coil only (submersible)) — the searchcoil can be submerged, but the control box must stay dry. It's not a diving detector, but it's fine for wet sand, rain, and shallow streams. See the full waterproofing FAQ
The ACE 400 hits the sweet spot in Garrett's lineup with a 0-99 Digital Target ID scale and adjustable frequency that helps reduce interference. Iron Audio lets you hear masked iron targets, preventing false digs. The included 8.5x11" DD coil covers ground efficiently while the USA-made build quality ensures years of reliable use.
Key Features:
- Digital Target ID with 0-99 scale
- Iron Audio for identifying iron targets
- Adjustable frequency (8.25 kHz ± 4 kHz)
- 8.5" x 11" DD PROformance searchcoil
- Electronic pinpointing
Price may vary. Last updated: Aug 17, 2026
Expert Overview
The Garrett ACE 400 represents Garrett's commitment to delivering reliable metal detection technology. Operating at 8.25 kHz (adjustable), this mid-range detector has earned its 4.6-star rating from over 1,184 verified users—a testament to its real-world performance.
Frequency
10 KHz
Weight
5.48 pounds
Battery
5 Hours
IP Rating
IP54
Coil
8.5" x 11" DD PROformance
Dimensions
15L x 6W x 22H
Technical Specifications
In-Depth Field Performance
Detection Depth & Coverage
In field testing, the Garrett ACE 400 demonstrates consistent target acquisition across various soil types. The 8.5" x 11" DD PROformance provides excellent ground coverage while maintaining sensitivity to smaller targets. With a maximum detection depth of 8-10" (coin), 12"+ (larger), it performs admirably for beginners and coins hunting. Recovery speed between targets is adequate for most hunting conditions, making it suitable for recreational hunting.
Target ID & Discrimination
Target identification on the Garrett ACE 400 uses 8 segments, adjustable notch to differentiate between valuable finds and junk. The 5 (Jewelry, Coins, Relics, Custom, Zero-Disc) search modes provide flexibility for different hunting scenarios. The Iron Audio feature lets you hear masked iron targets—a game-changer for relic hunters working in nail-infested sites. The Built-in speaker, 1/4" headphone jack delivers clear tones even in noisy outdoor environments.
Technology & Ground Handling
Garrett equipped the Garrett ACE 400 with 8.25 kHz (adjustable) technology, ideal for coins, jewelry, and common relics. The Preset (automatic) system automatically adapts to changing ground conditions. The submersible coil allows hunting in wet grass, shallow streams, and rainy conditions.
Build Quality & Ergonomics
Weighing 2.9 lbs (1.3 kg), the Garrett ACE 400 is lightweight enough for extended hunting sessions without fatigue. The 42" to 51" adjustable accommodates users of different heights. Build quality is excellent—made in the USA with quality materials. 15-20 hours means less worry about power during full-day hunts.
Settings & Modes Guide
Choosing a Search Mode
The Garrett ACE 400 offers 5 (Jewelry, Coins, Relics, Custom, Zero-Disc) search modes. For coin hunting in parks and yards or relic hunting, start with the preset closest to that target type — it pre-loads discrimination and tone breaks tuned for it — then fine-tune discrimination and sensitivity from there as you learn the site.
Discrimination Setup
Discrimination on the Garrett ACE 400 runs on 8 segments, adjustable notch. Notch narrowly rather than rejecting broad ranges of the scale — wide notches on a segmented display bury real targets that share a tone with trash. Run Iron Audio alongside discrimination rather than instead of it — it lets you hear a masked iron target under a good signal instead of silently notching the whole area out.
Ground Balance
The Garrett ACE 400 uses Preset (automatic) ground balance, so it compensates for mineralization on its own. You don't need to manually ground balance before each hunt, though depth in extremely mineralized or black-sand soil will be more conservative than on a detector with a manual override.
Sensitivity & Mineralization
The Garrett ACE 400 runs at 8.25 kHz (adjustable). In average, low-mineralization soil, sensitivity can run near the maximum stable threshold for the deepest signal. In mineralized ground — red clay, black sand, or salt-contaminated soil — back sensitivity down until the false chatter settles, then re-check your ground balance.
Pros & Cons
- 8.25 kHz frequency excellent for coins and jewelry
- Iron Audio lets you hear iron discrimination
- Digital Target ID with 0-99 scale for accurate identification
- Made in USA with excellent build quality
- Adjustable frequency helps in trashy sites
- No wireless headphones included
- Preset ground balance may struggle in highly mineralized soil
- Learning curve to master Iron Audio feature
Intermediate hobbyists looking for a feature-rich detector with accurate target ID
Gold prospecting or heavily mineralized beach hunting
Things to Know Before You Buy
No wireless headphones included
You'll want a separate wireless headphone solution if that matters to you.
Preset ground balance may struggle in highly mineralized soil
Something worth weighing before you buy, based on real owner feedback.
Learning curve to master Iron Audio feature
Budget a few outings to get comfortable before judging the detector on its full potential.
vs Competition
| Feature | Garrett ACE 400 | Minelab Vanquish 440 | Minelab X-Terra Pro |
|---|---|---|---|
| Price | $357.99 | $348.00 | $301.70 |
| Rating | 4.6 | 4.5 | 4.6 |
| Frequency | 8.25 kHz (adjustable) | Multi-IQ (simultaneous multi-frequency) | Multi-IQ+ (4, 8, 15 kHz + multi) |
| Weight | 2.9 lbs (1.3 kg) | 2.6 lbs (1.18 kg) | 2.47 lbs (1.12 kg) |
| Waterproof | Coil only (submersible) | Coil only (IP68) | IP68 to 5 meters (16 ft) |
What Else You Need With the Garrett ACE 400
A detector on its own finds targets it cannot recover. These are the tools experienced detectorists carry on every hunt — about $184.88 for the set, and none of them are optional once you have dug a few holes.
Garrett Pro-Pointer AT
The coil gets you inside a foot. A pinpointer gets you to the exact inch, which is the difference between a two-minute recovery and a ten-minute hole.
Check Price
Garrett Edge Digger
You cannot recover a target without digging it. A serrated digger is the first thing every detectorist buys after the machine itself.
Check Price
Garrett MS-2 Headphones
The faint targets are the deep ones. A speaker loses them to wind and traffic long before the coil does.
Check PriceFrequently Asked Questions
In optimal low-mineralized soil, the Garrett ACE 400 can detect a quarter-sized coin at 8-10" (coin), 12"+ (larger). Larger objects like relics and caches can be detected at greater depths. In highly mineralized ground, expect 15-20% reduction in depth. Actual results depend on soil conditions, target size, and discrimination settings.
Yes, the Garrett ACE 400 is excellent for beginners. It offers intuitive controls, preset search modes, and reliable target identification. The learning curve is manageable, and most new users are finding targets within their first hour of use.
The Garrett ACE 400 is coil-only waterproof (Coil only (submersible)): the searchcoil and lower shaft can be submerged, but the control box must stay dry. This is not a diving or full-submersion detector — but it is perfectly fine for wet sand, shallow streams, light rain, and dew-covered grass. If you plan to wade in water above the shaft or work the surf zone, you'll want a fully waterproof model instead.
Start on the search mode closest to "coins" — the Garrett ACE 400 ships with 5 (Jewelry, Coins, Relics, Custom, Zero-Disc) search modes, and the closest match pre-loads discrimination and tone breaks for that target type. Keep discrimination low at first so you don't skip real targets while you learn the site, and let the automatic ground balance handle mineralization for you. Tighten discrimination and sensitivity once you know what the local trash sounds like.
The Garrett ACE 400 uses 8 segments, adjustable notch for target ID. Start with little to no discrimination so you learn what iron, foil, and pull tabs sound like in your specific soil, then notch out only the confirmed junk tones — narrow notches beat wide ones, since wide rejection zones also bury real targets. Running Iron Audio alongside discrimination lets you hear masked iron instead of silently skipping over it.
The standard Garrett ACE 400 package includes: the detector unit, 8.5" x 11" DD PROformance, coil cover, headphones, requires AA batteries (sometimes included), and user manual. Some retailers offer accessory bundles with additional coils, carrying bags, and digging tools.
Yes, Garrett provides a 2 years manufacturer warranty for the Garrett ACE 400 in the USA through authorized dealers. As a USA-made product, service and parts are readily available. Register your detector after purchase for full warranty coverage.
The Garrett ACE 400 at $357.99 competes with mid-range options like the Minelab Vanquish and Nokta Legend. Key advantages include 8.25 khz frequency excellent for coins and jewelry and iron audio lets you hear iron discrimination. However, note that no wireless headphones included. See our comparison guides for detailed head-to-head analysis.
Final Verdict
Based on 1,184 reviews
The Garrett ACE 400 is an excellent choice for intermediate hobbyists looking for a feature-rich detector with accurate target id. With a proven track record of 4.6-star ratings from 1,184 users, it delivers on its promises in the field.
At $357.99, the Garrett ACE 400 competes in the mid-range segment. For intermediate hobbyists, it offers exceptional value with features typically found in more expensive units. The 2 years warranty provides peace of mind for your purchase.
Bottom Line: The Garrett ACE 400 at $357.99 hits the sweet spot between features and value. Perfect for hobbyists ready to step up their game.
Price may vary. Last updated: Aug 17, 2026
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Price may vary. Last updated: Aug 17, 2026
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