Description

The Nokta INV56 is a 22-inch by 19-inch DD search coil compatible exclusively with the Nokta Invenio metal detector, designed for detectorists working large open sites where coverage speed and depth matter. Invenio owners conducting field surveys, archaeological work, or extensive beach hunts need the ground coverage advantage this elliptical coil delivers. The DD configuration maintains target separation in mineralized soil while the waterproof construction extends use into surf and shallow water.

What’s Included with the Nokta INV56 Coil

• Nokta INV56 22″ x 19″ DD search coil for Invenio detector

Why Invenio Owners Reach for the INV56

• Massive 22×19 elliptical footprint covers more ground per sweep, cutting survey time on large sites by reducing the number of passes required to clear an area.
• Deeper target detection on large objects like caches, relics, and deeply buried coins compared to the stock Invenio coil, grounded in the larger coil diameter.
• DD coil geometry delivers superior ground balancing in mineralized soil and wet sand, maintaining stable operation where concentric coils struggle.
• Fully submersible construction allows hunting in surf zones, shallow rivers, and wet conditions without risking coil damage.
• Purpose-built for the Nokta Invenio 3D imaging system, ensuring seamless integration with the detector’s multi-frequency capabilities.

Field Coverage in Open Ground and Beach Hunts

Large Field Surveys and Archaeological Work

The 22×19 elliptical shape excels in open fields, pastures, and archaeological survey grids where the priority is covering maximum ground efficiently. The coil’s width reduces overlap requirements between sweep rows, and the DD configuration keeps target separation crisp even at the edges of the detection field. Invenio users working large properties or conducting systematic surveys gain measurable time savings. The depth advantage shows on larger targets like colonial relics, cache containers, and deeply buried artifacts that smaller coils miss.

Saltwater Beach and Surf Zone Detecting

The waterproof rating and DD ground balancing make this coil effective in wet sand and shallow surf. Saltwater beaches present high mineralization that destabilizes many coils, but the DD design maintains ground balance across tidal zones. The large footprint covers beach transects quickly during low-tide windows. Run the Invenio in its beach mode with the INV56 to handle saltwater interference while scanning for deep targets like silver coins and jewelry lost in storm cuts.

Specifications

• Compatibility: Nokta Invenio metal detector only
• Coil Size: 22in x 19in (55.9cm x 48.3cm)
• Configuration: DD (Double-D)
• Shape: Elliptical
• Waterproof: Yes, fully submersible
• Part Number: INV56

Why Buy from Serious Detecting

Serious Detecting is an authorized Nokta dealer, ensuring this INV56 coil ships with the manufacturer warranty and genuine Nokta construction. Our team runs Nokta metal detectors in the field and can answer setup questions specific to the Invenio platform. Every order includes free shipping, a 30-day return window, and our price-match guarantee on all metal detector search coils.