Nokta Invenio Metal Detector Overview
The Nokta Invenio pairs a VLF detection engine with Nokta's IPTU (Integrated Positional Tracking Unit) sensor and an Embedded Linux control unit with OpenGL graphics. The IPTU sensor computes the coil's right-left and forward-back movement and its height above the ground, and the Invenio combines that with the target signal to draw the target's shape, size and depth on a 7 inch 800 x 480 TFT screen. Nokta says an Artificial Neural Network refines the shape extraction and depth indication. The Invenio has six search modes, three non-motion (Basic, Expert, Ground Anomaly & Cavity) and three motion (All Metal, Fast, Deep), Automatic, Manual and Tracking ground balance, sensitivity from 01 to 99, a 00 to 99 Target ID, iron audio, tone break, notch filter, frequency shift, pinpoint, vibration, a backlight and an LED flashlight. The system box and shaft talk over a 2.4 GHz wireless link. The shaft runs on a 7.4 V 5400 mAh LiPo battery for about 9 hours and the system box on a 7.4 V 5500 mAh LiPo for about 5 hours. The system box weighs 1.7 kg (3.7 lb) with its battery and the shaft and handle 2.4 kg (5.3 lb); the length adjusts from 121 to 152 cm (48 to 60 inch). Menus come in 17 languages, firmware updates over USB from a PC, and Nokta covers the Invenio for 2 years.
Invenio vs. Invenio Pro: Which Should You Buy?
Both share the system box, IPTU sensor, shaft and handle, screen, six search modes, the INV28 11 x 7 inch and INV40 15.5 x 14 inch waterproof DD coils, the IP67 waterproof hard transport case and the 2-year warranty. The Invenio runs at 14 kHz only. The Invenio Pro adds 5 kHz and 20 kHz operating frequencies, the large INV56 waterproof DD coil with its carrying bag, and a spare 7.4 V 9500 mAh system box battery rated about 9 hours, almost twice the run time of the standard system box battery.
We recommend the Invenio Pro for cache and relic hunters who want to change frequency for the site and scan wide, deep areas with the INV56 coil, and for anyone planning long field days. The Invenio suits hunters who will stay at 14 kHz with the two standard coils. If your main goal is finding underground voids and you want a coil for every job, compare both with the Nokta Jeohunter 3D Dual System in the table below.
Nokta Invenio, Best For:
- Hunters who want 3D target images at a single 14 kHz frequency
- Cache and relic searches with the INV28 and INV40 coils
- Ground anomaly and cavity checks with the Ground Anomaly & Cavity mode
Nokta Invenio Pro, Best For:
- Detectorists who want 5 kHz for larger, high-conductive targets and 20 kHz for smaller ones
- Wide, deep scans with the INV56 coil
- Long days in the field on the spare 9500 mAh system box battery
- Survey-style work where the 3D image decides whether a deep hole is worth digging
Key Features That Matter in the Field
The 3D image is the reason to buy an Invenio. Because the IPTU sensor tracks where the coil is, the Invenio maps the scanned area and shows a target's shape and depth on screen before you dig. The three non-motion modes (Basic, Expert and Ground Anomaly & Cavity) are for slow scanning and imaging, with Ground Anomaly & Cavity aimed at voids and ground anomalies. The three motion modes (All Metal, Fast and Deep) are for swinging the coil like a conventional detector. The wireless link between the system box and the shaft keeps cables off the shaft, and vibration and the LED flashlight help in noise and low light. On the Invenio Pro we recommend 14 kHz as the starting point, 5 kHz for large and high-conductive targets and 20 kHz for smaller, low-conductive targets.
Where the Invenio Works Best and Its Limits
The Nokta Invenio metal detector earns its place on cache hunts, old homesites with deep iron and large copper, and ground anomaly and cavity surveys where target size and depth matter more than speed. It is a heavier, two-part system, with the system box at 1.7 kg (3.7 lb) and the shaft and handle at 2.4 kg (5.3 lb), and 3D scanning is slower than swinging and digging. We do not recommend the Invenio for quick park coin hunting or surf and wet salt sand beaches; for that work a lighter waterproof detector from the metal detectors range is the better choice. We recommend learning one search mode at a time and using the 3D image to confirm a target before committing to a deep dig.
Coils and Accessories That Fit the Nokta Invenio
Nokta lists three waterproof DD coils for the Invenio: the INV28 11 x 7 inch, the INV40 15.5 x 14 inch and the INV56, which comes with the Invenio Pro. Covers for the 11 x 7 inch and 15.5 x 14 inch coils and the INV56 carrying bag are in this collection.
The box for both models holds the system box, shaft and handle, IPTU sensor, the INV28 and INV40 coils with covers, a system box carrying case, carrying belt, KOSS headphones with a 6.3 mm (1/4 inch) jack, AC and car chargers, a USB cable, protective covers, an IPTU sensor carrying bag, coil mounting hardware, a screen sunshade and the IP67 hard transport case. Replacement parts in this collection include the 5500 mAh and 9500 mAh system box batteries, the shaft and handle battery, the IPTU sensor and its connection cable, AC and car chargers, the battery compartment cover, harness, carrying belt, bungee cord, shaft covers, screen sunshade, armrest, middle shaft, the system box case and the hard transport case. For wireless audio, see our guide to pairing Nokta wireless headphones to the Invenio.
Nokta Invenio vs. Invenio Pro vs. Jeohunter 3D Dual System vs. Deephunter 3D PRO Comparison
All four are Nokta VLF deep search systems with cavity detection and a 2-year warranty. They differ in how they show the target, the frequencies they run, the coils in the box and how they are powered.
| Feature | Nokta Invenio | Nokta Invenio Pro | Nokta Jeohunter 3D Dual System | Nokta Deephunter 3D PRO |
|---|
| Technology | VLF with IPTU positional sensor and 3D imaging | VLF with IPTU positional sensor and 3D imaging | VLF with 3D graphical display and cavity detection | VLF, two systems: 3D visual system (Mode 1) and audio system (Mode 2) |
| Operating Frequency | 14 kHz | 5, 14 or 20 kHz (selectable) | 12 to 13 kHz | 12.5 kHz (Mode 1), 17.5 kHz (Mode 2) |
| Search Modes | 6: Basic, Expert, Ground Anomaly & Cavity (non-motion); All Metal, Fast, Deep (motion) | 6: Basic, Expert, Ground Anomaly & Cavity (non-motion); All Metal, Fast, Deep (motion) | Metal detection and cavity detection | 2: Mode 1 visual (non-motion), Mode 2 audio (motion) |
| Cavity Detection | Yes (Ground Anomaly & Cavity mode) | Yes (Ground Anomaly & Cavity mode) | Yes, with all three coils | Yes (Mode 1) |
| Target Identification | Target ID 00 to 99 | Target ID 00 to 99 | Gold, Non-ferrous, Steel, Iron (T44, T100); Non-ferrous, Ferrous, Steel (T21) | Gold, Precious, Non-precious, Steel (Mode 1); low tone for ferrous (Mode 2) |
| Display | 7 inch 800 x 480 TFT | 7 inch 800 x 480 TFT | CSTN LCD (T44, T100); LED indicators on the T21 handle | Color 3D display (Mode 1) |
| Ground Balance | Automatic / Manual / Tracking | Automatic / Manual / Tracking | Manual | Manual |
| Included Coils | INV28 11 x 7 inch DD, INV40 15.5 x 14 inch DD | INV28 11 x 7 inch DD, INV40 15.5 x 14 inch DD, INV56 DD | T21 12 x 8.5 inch, T44 17.5 x 14 inch, T100 39.5 x 23.5 inch | T44 17.5 x 14 inch, T100 39.5 x 23.5 inch, C32 12.5 x 10 inch, C47 18.5 x 15.4 inch |
| Battery | Shaft 5400 mAh LiPo (about 9 hr), system box 5500 mAh LiPo (about 5 hr) | Shaft 5400 mAh, system box 5500 mAh, spare 9500 mAh system box battery (about 9 hr) | 14.8 V 3300 mAh LiPo: 8 hr (T21), 4 hr (T44, T100) | 14.8 V 3300 mAh LiPo: 4 hr (Mode 1), 24 hr (Mode 2) |
| Weight | System box 1.7 kg (3.7 lb), shaft and handle 2.4 kg (5.3 lb) | System box 1.7 kg (3.7 lb), shaft and handle 2.4 kg (5.3 lb) | T21 2.4 kg (5.3 lb), T44 2.6 kg (5.7 lb), T100 8.45 kg (18.6 lb) | 1.4 kg (3 lb) in Mode 1, 0.85 kg (1.9 lb) in Mode 2 |
| Carry Case | IP67 waterproof hard transport case | IP67 waterproof hard transport case, INV56 coil bag | Jeohunter carrying bag, leather system box bag, T100 coil bag | Carrying bag, leather system box bag, T100 coil bag |
| Warranty | 2 years | 2 years | 2 years | 2 years |
Why Buy the Nokta Invenio Metal Detector from Serious Detecting?
- Free Shipping on Orders Over $99: Your Nokta Invenio ships at no extra cost across the continental US.
- Authorized Nokta Dealer: Showroom in Ypsilanti, Michigan, full 2-year manufacturer warranty and product registration support.
- Help Before and After You Buy: Our staff answer setup, coil and Invenio questions by phone or email.
