What Won’t a Metal Detector Pick Up?
Not everything can be found with a metal detector. If your detector is missing targets, it may not be a settings issue, it could be the material itself.
Table of Contents
What Metal Detectors Can Detect
What Metal Detectors Cannot Detect
Why Some Materials Can’t Be Detected
Materials That Are Hard to Detect
Real-World Scenarios Where Detection Fails
How to Improve Detection Results
What Metal Detectors Can Detect
Metal detectors are designed to locate conductive metals, including:
- Iron and steel
- Aluminum
- Copper
- Gold and silver
They work by sending electromagnetic fields into the ground and detecting changes caused by metal objects.
What Metal Detectors Cannot Detect
Metal detectors cannot detect non-metal materials, including:
- Plastic
- Wood
- Glass
- Stone
- Rubber
If there is no metal content, the detector has nothing to react to.
Why Some Materials Can’t Be Detected
Metal detectors rely on electrical conductivity.
Materials that do not conduct electricity (non-conductive materials) do not disturb the electromagnetic field, so they remain invisible to the detector.
Materials That Are Hard to Detect
Some materials can be detected, but not easily:
Stainless Steel
Low conductivity makes it harder to detect compared to other metals.
Small or Thin Gold
Tiny gold pieces produce weak signals, especially at depth.
Deep Targets
Even detectable metals become harder to find as depth increases.
Mineralized Ground
Soil with high mineral content can mask signals.
Real-World Scenarios Where Detection Fails
1. Plastic Pipes Underground
A detector will not detect the pipe itself, only any metal components attached to it.
2. Jewelry with Minimal Metal
Items with very small metal content (or very thin chains) may not produce a strong signal.
3. Objects Too Deep
Even large metal objects can become undetectable beyond a certain depth.
4. Wet Sand and Saltwater
Salt and minerals can interfere with signals and reduce detection accuracy.
How to Improve Detection Results
To reduce missed targets:
- Adjust sensitivity carefully
- Use proper ground balancing
- Choose the right frequency
- Use appropriate coil size for your target
Understanding your detector’s limits is key to better performance.
Frequently Asked Questions
1. Can a metal detector detect plastic or wood?
No. Metal detectors only detect conductive metals, not non-metal materials.
2. Can stainless steel be detected?
Yes, but it is harder to detect due to its lower conductivity.
3. Why can’t my metal detector find gold?
Small or deep gold targets produce weak signals and may require proper settings or a more sensitive detector.
4. Do metal detectors work through concrete?
Yes, if there is metal inside or beneath the concrete. The concrete itself cannot be detected.
5. What affects detection accuracy the most?
Ground conditions, target size, depth, and detector settings all impact performance.
Related Readings
For more tips and product insights, check out our latest blogs:
Why Does Wet Sand Mess Up Your Metal Detector?
Why Does My Metal Detector Beep Everywhere?
For questions about Super Eye Metal Detectors, contact a Representative by calling 1-877-369-1199 or message us by clicking here.