Nokta SP22 8.5" DD Waterproof Search Coil for Simplex+ Metal Detector

The SP22 8.5" DD coil is designed for Simplex+ compatibility and will not fit other Nokta models or alternative brands. It is built to match the specific frequency and connection specifications of the Simplex+ control box. If you own a different detector in the Nokta lineup, please check the manufacturer's accessory chart to ensure you choose the correct compatible coil series.

The SP22 8.5" coil offers a more compact footprint than the standard 11-inch stock coil, providing an excellent balance between depth and sharp target separation. While a larger stock coil covers more open ground, the 8.5-inch diameter is significantly easier to maneuver through tight spots like brush, rocky riverbeds, and playground equipment. Additionally, its smaller detection window makes it much easier to isolate good targets when hunting in high-trash environments like old parks or homesteads. Added a natural nod to the 9.5x5 elliptical alternative here if you want to swap it: "Hunters looking for an even narrower footprint often look at elliptical options like the 9.5x5 spy coil, but the round SP22 provides better uniform depth across the entire blade of the sweep.

Yes, the SP22 coil is fully waterproof and rated for submersion up to 10 feet (3 meters), allowing you to confidently hunt along shorelines, wet beach sand, and shallow streams. When transitioning to saltwater environments, the DD architecture helps maintain stability against ground mineralization. Always remember to thoroughly rinse the coil, cover, and lower shaft connector with clean fresh water after saltwater use to prevent salt buildup over time.

The SP22's DD (Double-D) coil design produces a blade-shaped detection field that isolates targets more precisely in high-trash environments compared to the cone-shaped field of a concentric coil. When you sweep over multiple targets close together, the DD field detects each one individually rather than blending their signals into a single confusing tone, which is critical in urban parks or old homesteads with heavy iron contamination. DD coils also perform better in mineralized soil and saltwater because the overlapping transmit and receive windings cancel more ground noise, letting you run higher sensitivity without false signals. Explore metal detector search coils: dd, concentric, monoloop & sef upgrades to compare coil geometries across different hunting scenarios.

The SP22 coil requires no firmware updates or special settings changes on the Simplex+ detector. Once you attach the coil using the included mounting hardware, the detector works with your existing sensitivity, discrimination, and ground balance settings without any configuration needed. You may want to re-ground-balance after switching coils if you're hunting in mineralized soil to optimize performance for current conditions, but no detector adjustments are required to begin using the SP22. The installation process is straightforward and takes just minutes to complete.

The included protective cover absorbs impact from rocks, roots, and gravel during aggressive digging and dragging, preventing scratches and dings on the coil housing itself. We recommend using the cover in any environment with abrasive surfaces like rocky beaches, gravel paths, or plowed fields, as unprotected coils can develop cracks in the housing over time from repeated impacts. The cover protects your investment during demanding hunting sessions without interfering with your ability to detect targets. Using the protective cover is especially important when hunting aggressively in rocky terrain or areas where the coil frequently contacts hard surfaces.

The SP22 coil is covered by Nokta manufacturer warranty when purchased from an authorized dealer like Serious Detecting. To ensure your warranty coverage is active, keep your receipt and register your coil with Nokta after purchase. Using the included protective cover helps prevent physical damage that could affect your coil's longevity and performance. As a genuine Nokta part designed specifically for Simplex+ detectors, the SP22 meets the manufacturer's quality standards for materials and workmanship. Contact Nokta directly or reach out to us for specific warranty terms and claim procedures.

Yes. The Double-D (DD) configuration of the SP22 handles ground mineralization, hot rocks, and wet beach sand much more effectively than standard concentric coils. The overlapping transmit and receive design inherently cancels out a large portion of ground noise. For maximum stability and performance, perform a fresh ground balance on your Simplex+ detector whenever you transition to a new high-mineralization zone.