Independently researched Buying Guide
Best Metal Detector Frequency Choices
The “best frequency” is a target-and-ground decision, not a highest-number contest. Low frequencies favor larger high-conductive targets, high frequencies favor small low-conductive targets, SMF broadens general use, and pulse induction is a different architecture for severe ground.
Bottom line
Use SMF for general hunting; use specialist frequency only for a specialist job
X-Terra Elite is the general recommendation because Multi-IQ covers mixed targets and wet salt without constant frequency selection. Legend is better when the user wants SMF plus 4–40 kHz choices. Gold Kruzer’s 61 kHz is a tiny-gold specialist, while Axiom’s PI system is for mineralized prospecting—not evidence that one frequency is universally superior.
Decision table
Shortlist by buyer and terrain
| Model | Best fit | Frequency system | Main caution |
|---|---|---|---|
| Minelab X-Terra Elite | value-focused all-terrain users | Multi-IQ plus a 15 kHz single option | less advanced control than Equinox 900 |
| Nokta Legend | enthusiasts who want extensive tuning | SMF plus 4, 10, 15, 20 and 40 kHz | learning curve |
| Nokta Gold Kruzer | tiny natural gold and micro-jewelry hunters | 61 kHz single-frequency VLF | specialist rather than general-purpose detector |
| Garrett Axiom | mobile serious gold prospectors | Ultra-Pulse pulse induction | PI discrimination and premium cost |
Specific recommendations
The strongest options for different buyers
Minelab X-Terra Elite
simple Multi-IQ operation, low weight and deep waterproofing; best suited to value-focused all-terrain users.
- Multi-IQ plus a 15 kHz single option
- 5 m / 16 ft
- Limitation: less advanced control than Equinox 900
Nokta Legend
four profiles, gold mode and frequency flexibility; best suited to enthusiasts who want extensive tuning.
- SMF plus 4, 10, 15, 20 and 40 kHz
- 5 m / 16 ft
- Limitation: learning curve
Nokta Gold Kruzer
very high frequency and two specialized coils; best suited to tiny natural gold and micro-jewelry hunters.
- 61 kHz single-frequency VLF
- 5 m / 16 ft
- Limitation: specialist rather than general-purpose detector
Garrett Axiom
light PI build, multiple timings and two-coil bundles; best suited to mobile serious gold prospectors.
- Ultra-Pulse pulse induction
- waterproof coils; control box rain resistant
- Limitation: PI discrimination and premium cost
Decision analysis
What actually changes the purchase
Lower VLF frequencies around 5–10 kHz generally favor larger, higher-conductive targets and can penetrate mild ground effectively. Higher frequencies above roughly 15 kHz increase sensitivity to small, thin and low-conductive targets but can react more strongly to mineralization.
Mid frequencies around 10–20 kHz are practical compromises for coins, jewelry and relics. Simultaneous multi-frequency uses a range together and is especially valuable where target conductivities vary or wet salt complicates the ground response.
Frequency alone does not determine depth. Transmit design, coil, signal processing, recovery, ground balance and noise all matter. Pulse induction should not be described in kHz-shopping terms because it uses timed pulses and decay analysis rather than ordinary VLF phase response.
FAQ
Targeted questions answered
What frequency is best for coins?
Low-to-mid frequencies roughly 5–15 kHz are common, while SMF is the more versatile choice across coin types and changing soil.
What frequency is best for small gold?
High-frequency VLF—often 40 kHz and above—improves sensitivity to tiny low-conductive nuggets in manageable ground.
Why can high frequency struggle in mineralized soil?
It can respond more strongly to small ground variations, requiring careful balance, sensitivity and coil control. Severe ground may favor PI.
Is 15 kHz a good all-purpose frequency?
Yes. It is a practical compromise for coins, jewelry and relics, though SMF handles mixed terrain and wet salt more broadly.
Does lower frequency always detect deeper?
No. It can favor larger high-conductive targets, but soil, target size, coil and processing determine actual depth.
Should I use single frequency or SMF?
Use SMF for general mixed terrain and salt. Select a single frequency for interference management or a known specialized target/ground case.
What frequency does a pulse-induction detector use?
PI is better described by pulse timing and rate, not as an ordinary single-frequency VLF choice.
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