Fisher Impulse AQ Limited Pulse Induction Waterproof Metal Detector

The IMPULSE AQ is a specialist detector built specifically for saltwater beach hunting and finding gold jewelry in the surf and wet sand. It’s not a general-purpose detector but excels in its niche.

Because it uses Pulse Induction (PI) technology, the AQ is stable in wet salt and black sand while maintaining sensitivity to small, low-conductive gold targets (like thin chains and small rings). Many other detectors lose performance in these conditions.

The AQ was purpose-built for saltwater environments. Unlike VLF/multi-frequency detectors that must “turn down” sensitivity to quiet the salt, the AQ keeps its depth and signal strength in surf, wet sand, and mineralized beach conditions.

Yes. Thanks to its adjustable pulse delay, the AQ can be tuned to detect very small, low-conductive gold items that are often missed by other detectors.

The AQ has some iron rejection and audio masking to help reduce digging unwanted targets, especially nails. It does not have advanced digital target ID like some detectors — it’s designed for maximum performance on gold in salt, not fine discrimination.

The AQ achieves exceptional depth in wet salt and black sand where traditional detectors struggle. Depth varies by target size and conditions, but it’s known for reaching gold jewelry beyond the range of many VLF detectors.

Yes, the Fisher Impulse-AQ Limited is fully waterproof and designed specifically for underwater metal detecting. This pulse induction detector can be completely submerged, making it ideal for beach hunting, shallow water detecting, and underwater treasure hunting. The waterproof design includes sealed electronics and waterproof headphones, allowing you to search in surf, rivers, lakes, and other aquatic environments without worry.

As one of the premier waterproof metal detectors, the Impulse-AQ Limited offers exceptional depth detection capabilities even in mineralized salt water conditions. For questions about specific depth ratings or waterproof accessories, contact our team at Serious Detecting for expert guidance on advanced waterproof detectors.

The AQ’s rechargeable NiMH battery runs for about 3.5 hours per pack. Many users carry a spare pack to extend hunting time across tide cycles.

The IMPULSE AQ ships with a 12.5-inch mono coil, chosen for its combination of depth and sensitivity to small gold in saltwater environments. The coil is filled with lightened epoxy making it neutrally buoyant.

The Fisher Impulse-AQ Limited Pulse Induction Waterproof Metal Detector weighs 4.2 pounds, which is similar to many all-terrain detectors. Fisher designed it with excellent balance specifically for surf hunting and underwater detecting, making it comfortable to use during extended beach and water hunts. The weight actually helps with stability when you're fighting waves and surf conditions.

The AQ is best suited for beach hunters who primarily target gold jewelry in saltwater surf and wet sand. It is less suited for land relic hunting or coin shooting.

The Fisher Impulse-AQ Limited is specifically optimized for beach detecting and underwater hunting. While it can technically detect targets in parks and relic hunting sites, it's not the ideal choice for these environments.

The AQ lacks the fine discrimination and detailed target ID features that land hunters typically need to differentiate between valuable finds and common trash. For park and relic hunting, you'll want a detector with better discrimination capabilities from our beginner and intermediate detectors or advanced metal detectors collections.

If you're looking for the best detector for your specific hunting needs, contact our team at Serious Detecting for personalized recommendations based on your budget and target locations.