Garrett ACE 400 Metal Detector with Iron Audio
The Garrett ACE 400 is the top model in Garrett's ACE line of coin, relic and jewelry detectors. It runs at 10 kHz, which adds sensitivity to low and medium conductivity targets such as gold and lead, and the operating frequency is adjustable so you can shift it to clear electrical interference. A digital target ID reads each target on a 0 to 99 scale, and Iron Audio lets you hear discriminated iron so you can tell a good target from a rusty nail before you dig.
The ACE 400 ships with the 8.5 inch by 11 inch PROformance DD searchcoil, which is submersible for hunting wet ground, streams and the shallows. Five search modes plus Pinpoint, eight sensitivity levels and notch discrimination let you tune the detector to the site and the target. A backlit LCD shows the target ID, a coin depth indicator and a battery condition indicator at a glance.
The detector weighs 2.9 lbs (1.32 kg), adjusts from 42 inches to 51 inches and runs on four AA batteries that are included. ClearSound Easy-Stow headphones come in the box, and the ACE 400 is made in the USA.
GeoWork Supply ships the ACE 400 packed with its searchcoil cover and the owner's manual linked below. It suits coin shooters, relic hunters and beach detectorists who want digital target ID and Iron Audio in a light, simple to run machine.
What's Included:
- Garrett ACE 400 detector
- 8.5 inch by 11 inch PROformance DD searchcoil
- Searchcoil cover
- ClearSound Easy-Stow headphones
- 4 AA batteries, installed
- Owner's manual
Features
10 kHz Adjustable Operating Frequency
The ACE 400 runs at 10 kHz for added sensitivity to low and medium conductivity targets like gold and lead. The frequency is adjustable, so you can shift it to clear interference from power lines or another detector nearby.

Digital Target ID, 0 to 99 Scale
Every target reads on a 0 to 99 numeric scale so you can judge what is under the coil before you dig. The expanded target ID legend above the LCD also flags US coin denominations.

Iron Audio and Notch Discrimination
Iron Audio lets you hear discriminated iron that is normally silenced and adjust the mid-tone signal range, which helps you separate good finds from junk iron. Notch discrimination lets you accept or reject specific target segments based on what you are hunting.

8.5 by 11 in PROformance DD Submersible Coil
The included 8.5 inch by 11 inch PROformance DD searchcoil covers ground quickly and reaches good depth. It is submersible, so you can hunt wet grass, creek edges and the shallows without worrying about the coil.

Five Search Modes Plus Pinpoint
Five search modes plus electronic Pinpoint and eight sensitivity levels let you set the ACE 400 for coins, jewelry, relics or trashy ground. The coin depth indicator shows how deep a target sits so you can plan the dig.

Built for Coins, Relics, Jewelry and Beaches
The submersible coil and adjustable frequency make the ACE 400 at home in parks, old home sites, fields and on freshwater beaches. The backlit LCD stays readable in low light for early morning and evening hunts.

See the ACE 400 in the Field
Garrett's own field video walks through ACE detecting tips, from reading target signals to recovering coins, so you can get more out of the detector from your first hunt.
What's Included
Included with Your Purchase:
- Garrett ACE 400 detector
- 8.5 inch by 11 inch PROformance DD searchcoil
- Searchcoil cover
- ClearSound Easy-Stow headphones
- 4 AA batteries, installed
- ACE 400 owner's manual
Specifications
| Operating Frequency | 10 kHz, adjustable |
| Search Modes | 5 plus Pinpoint |
| Target ID | Digital, 0 to 99 scale |
| Iron Audio | Yes, adjustable |
| Audio Tone ID Levels | 3 |
| Iron Discrimination Segments | 4 |
| Searchcoil | 8.5 in x 11 in PROformance DD, submersible |
| Sensitivity Adjustments | 8 levels |
| Display | LCD with digital target ID, depth and battery indicators |
| Headphones | ClearSound Easy-Stow, included |
| Length | 42 in to 51 in (1.06 m to 1.29 m), adjustable |
| Weight | 2.9 lbs (1.32 kg) |
| Battery | 4 AA, included |
| Made In | USA |
| Warranty | 3 year limited |
FAQ
Q: What is the operating frequency of the Garrett ACE 400?
A: The ACE 400 runs at 10 kHz, which gives it added sensitivity to low and medium conductivity targets such as gold and lead. The frequency is adjustable so you can shift it to clear interference.
Q: Is the Garrett ACE 400 coil waterproof?
A: The 8.5 inch by 11 inch PROformance DD searchcoil is submersible, so you can hunt wet ground, creek edges and the shallows. The control housing is not waterproof and should be kept dry.
Q: What does Iron Audio do?
A: Iron Audio lets you hear discriminated iron that is normally silenced and adjust the mid-tone signal range. It helps you separate good targets from rusty nails and other junk iron before you dig.
Q: What comes in the box?
A: The ACE 400 ships with the detector, the 8.5 inch by 11 inch DD searchcoil and cover, ClearSound Easy-Stow headphones, four AA batteries and the owner's manual.
Q: How is the ACE 400 different from the ACE 300?
A: The ACE 400 runs at 10 kHz, adds Iron Audio and a larger 8.5 inch by 11 inch DD coil, and includes headphones. The ACE 300 runs at 8 kHz with a 7 inch by 10 inch coil and no Iron Audio.
Q: Is the Garrett ACE 400 good for beginners?
A: Yes. The ACE 400 has preset search modes and simple pushbutton controls, so a new detectorist can start in a coin or jewelry mode, while the digital target ID and Iron Audio give an experienced user more to work with.
Warranty
Garrett backs the ACE 400 with a 3 year limited warranty against defects in materials and workmanship.