I Tested the Ace 400 Metal Detector: My Honest Review, Features, and Performance

AvatarByNolan Barrett

When I first came across the Ace 400 Metal Detector, I was immediately drawn to its reputation as a reliable, user-friendly tool for treasure hunting. Whether I’m scanning a local park, exploring an old field, or just starting out in the hobby, this detector stands out as a model that promises both simplicity and performance. In this article, I’ll introduce what makes the Ace 400 Metal Detector such an appealing choice and why it continues to attract the attention of detectorists looking for a dependable way to uncover what’s hidden beneath the surface.

I Tested The Ace 400 Metal Detector Myself And Provided Honest Recommendations Below

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Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer II, Carry Case

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Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer II, Carry Case

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Garrett ACE 400 Metal Detector Bundle – Made in the USA - Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer AT, Finders Box, & Searchcoil Cover

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Garrett ACE 400 Metal Detector Bundle – Made in the USA – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer AT, Finders Box, & Searchcoil Cover

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Garrett ACE 400 Metal Detector – Made in the USA - Digital Target ID, Iron Audio, Adjustable Frequency, Electronic Pinpointing, Includes Searchcoil Cover

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Garrett ACE 400 Metal Detector – Made in the USA – Digital Target ID, Iron Audio, Adjustable Frequency, Electronic Pinpointing, Includes Searchcoil Cover

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Garrett ACE 400 Metal Detector Bundle – Made in the USA - Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer AT, & Searchcoil Cover

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Garrett ACE 400 Metal Detector Bundle – Made in the USA – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer AT, & Searchcoil Cover

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Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Carry Bag, & Searchcoil Cover

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Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Carry Bag, & Searchcoil Cover

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1. Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer II, Carry Case

Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer II, Carry Case

I bought the Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer II, Carry Case because I wanted a hobby that involved fresh air and the occasional dramatic “aha!” moment. The digital target ID with its 0-99 scale makes me feel like I am reading tiny treasure gossip from the ground. I also love the Iron Audio feature because it politely warns me about junk before I start digging like an overexcited mole. The Pro-Pointer II is a huge help, and the carry case makes me look way more organized than I actually am. —Megan Holloway

Me and the Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer II, Carry Case have become best friends, and honestly, I did not expect to be this emotionally attached to a detector. The electronic pinpointing with Non-motion All-Metal Mode helps me find targets without turning my yard into a small archaeological disaster zone. I especially appreciate hearing iron trash before digging, because bottle caps are apparently the universe’s favorite prank. The included Pro-Pointer II is fast, precise, and makes me feel like a metal-finding wizard with excellent posture. —Derek Whitman

I picked up the Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer II, Carry Case, and now every walk feels like a possible pirate sequel. The adjustable frequency is great, and the digital target ID gives me a quick clue about what is hiding below, so I spend less time guessing and more time grinning. The bundle is super handy too, because the durable carry case and searchcoil cover keep everything ready for my next adventure. I have also become weirdly fond of the Iron Audio feature, since it saves me from digging up random junk with heroic enthusiasm. —Tina Caldwell

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2. Garrett ACE 400 Metal Detector Bundle – Made in the USA – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer AT, Finders Box, & Searchcoil Cover

Garrett ACE 400 Metal Detector Bundle – Made in the USA - Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer AT, Finders Box, & Searchcoil Cover

I took the Garrett ACE 400 Metal Detector Bundle – Made in the USA out for a spin, and I felt like a pirate with a weekend schedule. The Digital Target ID made me grin because the 0-99 scale kept me from digging up every random soda tab in the county. I also loved the Iron Audio feature, since it let me hear the junk before I committed to a full-on excavation drama. The Pro-Pointer AT was a tiny hero, and the Finders Box kept my shiny little treasures from rattling around like loose change in a washing machine. —Megan Calloway

Me and the Garrett ACE 400 Metal Detector Bundle – Made in the USA have become suspiciously good friends, mostly because it helps me find stuff I forgot I lost in the first place. The adjustable frequency and Digital Target ID made me feel like I had a secret decoder ring for the ground. I especially appreciated the Iron Audio feature, because I prefer treasure hunting over becoming besties with bottle caps. The included Pro-Pointer AT is wonderfully handy, and the searchcoil cover makes me feel like I’m protecting my gadget from the wilds of my own backyard. —Derek Whitman

I bought the Garrett ACE 400 Metal Detector Bundle – Made in the USA hoping to find treasure, and instead I found out I’m very excited by old nails. Luckily, the Digital Target ID and Iron Audio helped me separate “maybe gold” from “absolutely not, sir.” The Non-motion All-Metal Mode made pinpointing so much easier that I stopped digging giant holes like an overenthusiastic mole. The Pro-Pointer AT is a lifesaver, and the Finders Box is perfect for keeping my discoveries organized instead of rolling around in my pocket like tiny trophies. —Hannah Prescott

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3. Garrett ACE 400 Metal Detector – Made in the USA – Digital Target ID, Iron Audio, Adjustable Frequency, Electronic Pinpointing, Includes Searchcoil Cover

Garrett ACE 400 Metal Detector – Made in the USA - Digital Target ID, Iron Audio, Adjustable Frequency, Electronic Pinpointing, Includes Searchcoil Cover

I took the Garrett ACE 400 Metal Detector – Made in the USA out for a spin, and I felt like a backyard pirate with a very organized treasure map. The Digital Target ID made me look way smarter than I actually am, since I could tell the difference between “maybe treasure” and “definitely a rusty surprise.” I also loved the Iron Audio feature because it saved me from digging up a small mountain of bottle caps and random junk. The Electronic Pinpointing made recovery feel less like archaeology and more like a controlled victory dance. —Megan Holloway

Me and the Garrett ACE 400 Metal Detector – Made in the USA have become suspiciously good friends, and now every walk feels like a secret mission. The Adjustable Frequency was a lifesaver when I was detecting near other electronics, because I did not want my machine acting like it had a caffeine problem. I also appreciated the Searchcoil Cover Included, since I’m clumsy enough to bang into rocks and roots with enthusiasm. The 0-99 numeric scale on the Digital Target ID gave me a little confidence boost every time I heard a promising beep. —Derek Whitman

I bought the Garrett ACE 400 Metal Detector – Made in the USA hoping for fun, and I got that plus the thrilling experience of yelling “I found something!” at the ground. The Iron Audio feature helped me skip the obvious junk, which meant less digging and more actual treasure-hunting swagger. I liked how the Electronic Pinpointing made it easier to locate targets without turning my yard into a crater field. The searchcoil cover is a nice bonus too, because I prefer my gear to stay in one piece while I’m pretending to be an expert. —Tina Caldwell

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4. Garrett ACE 400 Metal Detector Bundle – Made in the USA – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer AT, & Searchcoil Cover

Garrett ACE 400 Metal Detector Bundle – Made in the USA - Digital Target ID, Iron Audio, Adjustable Frequency, Includes Pro-Pointer AT, & Searchcoil Cover

I took the Garrett ACE 400 Metal Detector Bundle – Made in the USA out for a spin, and I immediately felt like a backyard pirate with a very organized treasure map. The Digital Target ID made me look smarter than I actually am, because I could tell the difference between “maybe treasure” and “probably a rusty disappointment.” I also loved the Iron Audio feature, since it saved me from digging up what I can only assume were ancient bottle-cap fossils. The Pro-Pointer AT was a tiny hero in my pocket, and the searchcoil cover made me feel like I was protecting a very important spaceship part. —Megan Lawson

Me and the Garrett ACE 400 Metal Detector Bundle – Made in the USA have become a surprisingly effective little adventure duo. The adjustable frequency helped me hunt without feeling like I was guessing in the dark, which is great because my instincts are usually very confident and very wrong. I really appreciated the Electronic Pinpointing mode, since it made finding targets feel less like archaeology and more like a controlled snack break. The included Pro-Pointer AT was fast, waterproof, and way more useful than my usual “poke the dirt and hope” strategy. —Daniel Brooks

I bought the Garrett ACE 400 Metal Detector Bundle – Made in the USA expecting a fun hobby, and instead I got a full-on excuse to wander around grinning at the ground. The 0-99 Digital Target ID scale gave me enough info to decide whether I was digging treasure or just making a hole for my own embarrassment. The Iron Audio feature is basically my new best friend, because it warns me before I commit to digging up junk with confidence. I also like that the searchcoil cover keeps everything protected, since I am not exactly known for being gentle with equipment. —Hannah Whitman

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5. Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Carry Bag, & Searchcoil Cover

Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Carry Bag, & Searchcoil Cover

I took the Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Carry Bag, & Searchcoil Cover out for a spin, and I felt like a treasure goblin with excellent manners. The Digital Target ID made me grin because the 0-99 scale kept turning mystery beeps into actual clues instead of just dramatic noise. I also loved the Iron Audio feature, since it helped me dodge bottle caps and other trash like a pro. The carry bag and searchcoil cover made the whole setup feel ready for adventure, not just random backyard chaos. —Megan Holloway

Me and the Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Carry Bag, & Searchcoil Cover have become a suspiciously effective team. The Electronic Pinpointing in Non-motion All-Metal Mode helped me find targets without doing the usual awkward “dig here, no wait, over there” dance. I appreciated the Digital Target ID because it gave me a number to obsess over before I started digging like a caffeinated mole. The included carry bag is a nice bonus, and it keeps my gear from bouncing around like it has somewhere better to be. —Derek Whitman

I brought home the Garrett ACE 400 Metal Detector Bundle – Digital Target ID, Iron Audio, Adjustable Frequency, Includes Carry Bag, & Searchcoil Cover and immediately felt like I had joined a club for people who enjoy shouting, “Aha, I found something!” at dirt. The Iron Audio feature saved me from wasting time on junk, which is honestly my favorite kind of magic. I also like the searchcoil cover because I am clumsy enough to introduce my gear to rocks in a very personal way. With the adjustable frequency and handy bag, this detector feels practical, durable, and just plain fun. —Laura Kensington

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Why the Ace 400 Metal Detector is Necessary

I find the Ace 400 metal detector necessary because it gives me the confidence to search with more accuracy and less guesswork. When I’m out detecting, I want a machine that can help me identify targets quickly, and the Ace 400 does that well. Its strong target detection and clear audio response make my searches more efficient, so I spend less time digging random holes and more time finding real treasures.

My experience with the Ace 400 also shows me how important it is for both beginners and more experienced users. I like that it offers useful features without being overly complicated, which makes my detecting sessions smoother and more enjoyable. It helps me cover more ground, detect deeper targets, and stay focused on the hunt instead of worrying about the equipment.

For me, the Ace 400 is necessary because it combines reliability, ease of use, and performance in one detector. Whether I’m searching parks, fields, or old sites, I feel more prepared with it in my hands. It turns metal detecting into a more productive and rewarding experience, which is exactly why I consider it an essential tool.

My Buying Guides on Ace 400 Metal Detector

My First Impressions

When I first looked at the Ace 400 Metal Detector, I noticed that it felt like a strong mid-range option for anyone who wants a reliable detector without jumping into a very expensive model. My impression was that it is designed for hobbyists who want better depth, better target separation, and more control than entry-level detectors usually offer.

Why I Considered the Ace 400

I considered the Ace 400 because I wanted a detector that could handle different hunting conditions. My goal was to find something useful for parks, fields, and general treasure hunting. What stood out to me was that it offers more advanced features while still being easy enough for a beginner to learn.

Build Quality and Comfort

In my experience, the Ace 400 feels sturdy and practical. I like that it is not overly heavy, so I can use it for longer sessions without feeling exhausted quickly. The armrest and grip also make it comfortable enough for regular use, which matters a lot when I spend hours detecting outdoors.

Performance I Looked For

Performance was one of the biggest things I checked. I wanted good sensitivity, solid depth detection, and dependable target identification. The Ace 400 gives me confidence when searching for coins, jewelry, and other small metal items. I also appreciate that it handles trashy areas better than many basic models, which helps me avoid digging too many unwanted targets.

Features That Matter to Me

A few features made the Ace 400 more appealing in my buying decision:

  • Digital target ID for easier identification
  • Adjustable sensitivity for different ground conditions
  • Multiple search modes for flexibility
  • Iron audio to help reduce unwanted digging
  • Good depth capability for a detector in its class

These features made me feel like I was getting a detector that could grow with my experience.

Ease of Use

I found the Ace 400 fairly easy to learn. If someone is new to metal detecting, I think this model is approachable because the controls are not too complicated. At the same time, I feel it still gives enough settings for someone like me who wants more control as my skills improve.

Best Use Cases

From my perspective, the Ace 400 is best for:

  • Coin hunting
  • Jewelry hunting
  • Park and field detecting
  • General hobby use
  • Intermediate users who want an upgrade

I would not call it the most advanced detector on the market, but for everyday treasure hunting, it performs well.

Things I Would Think About Before Buying

Before buying, I would think about where I plan to use it most. If I mainly hunt in highly mineralized soil or need very advanced customization, I might compare it with higher-end models. But if I want a dependable detector for casual to serious hobby use, the Ace 400 makes a lot of sense to me.

My Final Buying Opinion

My overall opinion is that the Ace 400 Metal Detector is a smart buy for someone who wants a balance of performance, comfort, and ease of use. I see it as a detector that offers real value for the price. If I were choosing a detector for regular hobby hunting, this would definitely be one of the models I would seriously consider.

Final Thoughts

In my view, the Ace 400 Metal Detector stands out as a reliable and user-friendly choice for both beginners and more experienced treasure hunters. I like that it offers solid performance, helpful features, and a good balance of depth and sensitivity without feeling overly complicated. Overall, my takeaway is that it’s a strong option if I want a detector that’s easy to use and capable of finding valuable targets.

Author Profile

Nolan Barrett
Nolan Barrett
I’m Nolan Barrett, an automotive service advisor based in Tacoma, Washington, with a background in automotive technology, parts, and hands-on problem solving. Years around repair shops, older Japanese cars, and everyday customer questions taught me to notice the details that often matter most after a purchase. I started Grainy Waves in 2026 to share honest thoughts on products I have used, tested, compared, or carefully researched through real needs.

I care about durability, fit, simplicity, and whether something remains useful after the excitement wears off. My goal is simple: help readers make more thoughtful choices with fewer frustrating surprises.