What an OKM Fusion does
Every OKM Fusion edition works the same basic way. You walk a scan field in parallel lines while the control unit records measurements, then view the result as a color-coded 3D graphic in OKM's Visualizer 3D Studio software on a Windows computer. The image shows anomalies, meaning spots that differ from the surrounding soil, and helps you judge their position, size and depth. Each Fusion edition also has a magnetometer mode for ferrous metal (OKM calls it Magnetometer on the Ultra Light and Light, and Live Sound on the Professional editions). OKM says experienced users run it first to clear surface iron out of the scan field, so small junk does not clutter the 3D image of deeper targets.
Reading Fusion scans takes practice. We tell first-time buyers to scan the same field more than once, from different directions, before they dig, because a real anomaly should show up in each pass.
The four OKM Fusion editions and what each adds
Fusion Ultra Light: the control unit (about 700 g, 800 mm long) with 3D Ground Scan and Magnetometer, a download code for the OKM Android app, and Visualizer 3D Studio Standard Edition on a USB drive, shipped in a protector tube. You supply the Android phone (Android 7.1 or newer with Bluetooth 5.1) and the Windows 10 computer; OKM lists no iPhone app. If you already own both, the Ultra Light is enough to learn OKM 3D scanning at the lowest cost in the series.
Fusion Light: the same 700 g control unit and the same two modes, but OKM supplies an Android smartphone with the app installed, a Windows notebook with Visualizer 3D Studio Standard Edition (one license) and a waterproof, shock-resistant protector case. Choose it if you would rather have a dedicated phone and laptop for the scanner than use your own.
Fusion Professional: a longer control unit (about 1 kg, 950 mm) with the SRIS search coil built in, Live Sound through included Bluetooth headphones, a pre-configured Windows notebook and Visualizer 3D Studio Standard Edition with four licenses. There is no phone app: you hold the probe vertically in one hand and the notebook in the other. The SRIS coil locates metal close to the surface, and its most practical use is checking excavated soil for small items such as rings, coins and buttons once you open a hole.
Fusion Professional Plus: everything in the Fusion Professional, plus horizontal probe orientation on a height-adjustable telescopic rod with a notebook mount, two Live Scan modes and Visualizer 3D Studio Professional Edition. Horizontal Live Scan uses OKM's Multi-Sensor probe to show an instant color-coded 2D picture as you walk. Vertical Live Scan gives an image similar to an ultrasound that you can move back and forth without a fixed scan pattern, which OKM says suits narrow galleries and tunnels. The Professional Edition software adds PDF reports, CSV export, scan field overlays and more soil types than the Standard Edition.
All four Fusion editions run about 12 hours per charge, according to OKM. None of them are waterproof: OKM rates the control units IP40, so they are for dry conditions. OKM covers each edition with a two-year guarantee. The contents above are OKM's published scopes of delivery as of October 2026, and OKM notes that contents can vary.
How deep OKM rates the Fusion
OKM gives Fusion depth figures as objects its customers have found, not as a tested specification, and those figures apply to large objects and voids, not to coins or small jewelry. For the Fusion Ultra Light and Fusion Light, OKM says customers found objects down to 8 m (26 ft). For the Fusion Professional, OKM says 21 m (69 ft). For the Fusion Professional Plus, OKM's own product page gives both 21 m (69 ft) and 25 m (82 ft). Real depth with any Fusion depends on the size of the target, the soil and how carefully the scan grid is walked. Our guide How Deep Do Metal Detectors Go? explains why target size matters so much.
Accessories for the OKM Fusion, and what does not apply
The OKM Fusion has no interchangeable search coils. The sensors, and the SRIS coil on the Professional editions, are built into the control unit, so coils and coil covers made for conventional detectors do not fit. The Fusion Professional and Professional Plus include Bluetooth headphones; the Fusion Ultra Light does not. OKM sells a Visualizer 3D Activation Pack and 3D software training separately for owners who want more software activations or help reading scans.
The Fusion Ultra Light and Fusion Light have no SRIS coil, so we suggest adding a pinpointer such as the OKM Fortuna XELA to check the spoil pile when you dig on a scanned target.
Shoppers we steer away from the Fusion
Most people who ask us about an OKM Fusion are best served by one of the Fusion editions above. A few are not, and we would rather say so before the order than after.
You want to swing and dig coins, rings and relics. No 3D ground scanner is the right tool for targets in the top foot of soil. A conventional detector from our relic and treasure metal detectors does that job faster and at a fraction of the cost.
You want a detector and a 3D scanner in one unit. The OKM Evolution NTX pairs a VLF search coil for shallow metal with 3D scanning in one unit. On the Fusion Professional editions, the SRIS coil is for checking near-surface metal and excavated soil, not for swing-and-dig detecting.
You do not want to carry a phone or laptop in the field. The OKM Rover series shows results on the unit: the Rover UC on a supplied smartwatch, the Rover C4 on its own touchscreen.
Your scan fields are large. The OKM eXp 5500 scans with up to five sensors side by side and adds a VLF coil with target ID zones.
Your targets are not metal. For concrete, pipes or cavities, OKM's radar unit, the OKM Gepard GPR, is built for that job.
To compare the Fusion with imaging systems from other makers, see our 3D imaging metal detectors.
