{"product":{"id":8289421820188,"title":"Nokta INV28 11x7 DD Waterproof Coil for Invenio Metal Detector","body_html":"\u003cp\u003eThe Nokta INV28 is an 11-inch by 7-inch elliptical DD search coil built for the Nokta Invenio metal detector, delivering wider ground coverage and sharper target separation in mineralized soil and trashy sites. Invenio owners working parks, beaches, and relic fields where multiple targets cluster within a sweep reach for this coil when the stock configuration misses masked finds. The Double-D geometry excels in moderate-to-heavy trash and wet saltwater sand where concentric coils struggle with ground noise.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's Included with the Nokta INV28 Coil\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eNokta INV28 11x7 DD waterproof search coil for Invenio detector\u003c\/li\u003e\n\u003cli\u003eProtective coil cover\u003c\/li\u003e\n\u003cli\u003eMounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Invenio Owners Reach for the INV28 Coil\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eWider 11x7 elliptical footprint covers more ground per sweep than smaller coils.\u003c\/li\u003e\n\u003cli\u003eDouble-D configuration separates adjacent targets in trashy park sites where iron and foil mask good finds.\u003c\/li\u003e\n\u003cli\u003eFully waterproof construction handles wet sand, shallow water, and rain without performance drop, extending your hunting window to surf lines and freshwater wading zones.\u003c\/li\u003e\n\u003cli\u003eDirect-fit mounting for Invenio detectors requires no adapters or balance adjustments, swap takes under two minutes in the field.\u003c\/li\u003e\n\u003cli\u003eIncluded coil cover protects the housing from rocks, roots, and abrasive surfaces, extending the coil's lifespan significantly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSharper Target Separation in Trashy Park Sites\u003c\/h2\u003e\n\u003ch3\u003eUrban Park Hunts with Heavy Iron Contamination\u003c\/h3\u003e\n\u003cp\u003eThe INV28's DD field pattern rejects ground minerals and isolates individual targets in iron-heavy turf where pull-tabs and bottle caps cluster around benches and playground edges. The 11x7 ellipse fits between playground posts and under low-hanging equipment, maintaining the coverage advantage without sacrificing maneuverability. Run the Invenio's discrimination at mid-range and let the coil's geometry do the separation work.\u003c\/p\u003e\n\n\u003cfigure\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0760\/1464\/9628\/files\/17000145_Inline.jpg?v=1779395314\" alt=\"Black DD search coil with shaft attachment and waterproof housing for metal detector\"\u003e\n\u003c\/figure\u003e\n\n\u003ch3\u003eWet-Sand Stability on Saltwater Beaches\u003c\/h3\u003e\n\u003cp\u003eSaltwater mineralization causes concentric coils to chatter and false in the surf zone; the INV28's DD geometry cancels that ground noise and holds stable tone response across wet-to-dry transitions. The waterproof housing handles wave splash and submersion to the shaft collar.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Nokta Invenio metal detectors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoil Size:\u003c\/strong\u003e 11in x 7in (28cm x 18cm) elliptical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Double-D (DD)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof Rating:\u003c\/strong\u003e Fully waterproof (coil and cable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Coil cover, mounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Buy from Serious Detecting\u003c\/h2\u003e\n\u003cp\u003eSerious Detecting is an \u003ca href=\"https:\/\/seriousdetecting.com\/pages\/customer-care__about-us\"\u003eauthorized Nokta dealer\u003c\/a\u003e, every INV28 coil ships with the full manufacturer warranty and our 30-day return policy. Our team runs \u003ca href=\"https:\/\/seriousdetecting.com\/collections\/nokta\"\u003eNokta metal detectors\u003c\/a\u003e in the field and can answer setup questions specific to the Invenio platform. Free shipping applies to all coil orders. We price-match any authorized dealer and stock a full range of \u003ca href=\"https:\/\/seriousdetecting.com\/collections\/coils\"\u003emetal detector search coils: DD, concentric, monoloop \u0026amp; SEF upgrades\u003c\/a\u003e for cross-platform comparison when you're ready to expand your coil arsenal.\u003c\/p\u003e","vendor":"Nokta Detection Technologies","product_type":"Coils","created_at":"2023-05-18T23:00:25-04:00","handle":"nokta-inv28-11-x-7-waterproof-dd-search-coil-for-invenio-metal-detector","updated_at":"2026-06-04T11:03:15-04:00","published_at":"2023-05-18T23:00:25-04:00","template_suffix":null,"published_scope":"web","tags":"11x7-coil, beach-hunting, coil-upgrade, dd-coil, elliptical-coil, invenio, invenio-pro, nokta, nokta-accessories, park-hunting, search-coil, trash-separation, waterproof-coil","variants":[{"id":45211741290780,"product_id":8289421820188,"title":"Default Title","price":"152.99","sku":"17000145","position":1,"compare_at_price":"179.99","fulfillment_service":"manual","inventory_management":"shopify","option1":"Default Title","option2":null,"option3":null,"created_at":"2023-05-18T23:00:25-04:00","updated_at":"2026-06-04T11:03:15-04:00","taxable":true,"barcode":"8699394001452","grams":709,"image_id":null,"weight":1.5625,"weight_unit":"lb","requires_shipping":true,"quantity_rule":{"min":1,"max":null,"increment":1},"price_currency":"USD","compare_at_price_currency":"USD","quantity_price_breaks":[]}],"options":[{"id":10507515724060,"product_id":8289421820188,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":41207322902812,"product_id":8289421820188,"position":1,"created_at":"2023-05-18T23:00:25-04:00","updated_at":"2023-05-18T23:00:25-04:00","alt":"Nokta INV28 11x7 DD waterproof search coil with protective cover for Invenio metal detector","width":1600,"height":1600,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0760\/1464\/9628\/products\/20000769__01.jpg?v=1684465225","variant_ids":[]},{"id":41207322935580,"product_id":8289421820188,"position":2,"created_at":"2023-05-18T23:00:25-04:00","updated_at":"2023-05-18T23:00:25-04:00","alt":"Nokta INV28 coil showing connector and mounting hardware included","width":1600,"height":1600,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0760\/1464\/9628\/products\/20000769__02.jpg?v=1684465225","variant_ids":[]}],"image":{"id":41207322902812,"product_id":8289421820188,"position":1,"created_at":"2023-05-18T23:00:25-04:00","updated_at":"2023-05-18T23:00:25-04:00","alt":"Nokta INV28 11x7 DD waterproof search coil with protective cover for Invenio metal detector","width":1600,"height":1600,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0760\/1464\/9628\/products\/20000769__01.jpg?v=1684465225","variant_ids":[]}}}