The OKM eXp 5500 Professional is OKM's multi-sensor 3D ground scanner with a built-in VLF metal detector mode. Its PentaSense system scans with the Super Sensor alone or with Enhancer modules as one, three or five sensors side by side, a 14 x 10 inch VLF PentaCoil handles shallow metal, and an 8.4 inch touchscreen control unit runs about 7 hours on a replaceable battery. It is made for archaeologists, treasure hunters and cavity searchers who survey wide scan fields and want a working VLF detector on the same site. Our eXp 5500 collection holds the complete Professional package.
OKM eXp 5500 Professional 3D Ground Scanner
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OKMSale Price $20,320.00 Regular Price$21,838.95
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OKM eXp 5500 Professional Overview
The OKM eXp 5500 has three operating modes. 3D Ground Scan records the scan field for a 3D image in Visualizer 3D Studio Professional Edition on the included Windows notebook. Magnetometer responds to ferrous metal. VLF Metal Detection uses the PentaCoil, a 14 x 10 inch VLF search coil, for metal in shallow soil.
The control unit has an 8.4 inch IPS touchscreen at 1024 x 768 pixels and a replaceable lithium-ion battery that OKM rates at about 7 hours fully charged at 25 °C (77 °F) and medium brightness, recharged in about 3 hours. OKM rates the control unit, Super Sensor, Enhancers and PentaCoil IP40 and lists the control unit as not waterproof, with an operating range of -10 to 50 °C (14 to 122 °F). OKM covers the eXp 5500 with a 2-year guarantee.
PentaSense: Scanning with One, Three or Five Sensors
The Super Sensor can be used on its own or with Enhancer modules that plug into its sockets. OKM describes three set-ups:
1 sensor: the Super Sensor alone, for narrow areas such as caves, passages and crevices.
3 sensors: the Super Sensor with two Enhancers on one side.
5 sensors: the Super Sensor with all four Enhancers, the full PentaSense system, which OKM says does the work of five Super Sensors side by side.
The PentaSense Rod holds the probe out in front of you so you can balance it on sloping ground, and OKM says the extra distance keeps you from influencing the measurement. More sensors cover a wide field in fewer passes; on a small, cluttered site, the single-sensor set-up is often the easier one to walk.
eXp 5500 vs Delta Ranger: Which Should You Buy?
The eXp 5500 is for imaging a site in detail: several sensors side by side, Professional Edition software for reports, and a VLF coil for shallow metal. The Delta Ranger is for finding where to look on a big area with long-range and thermal modes, then checking the spot with a 3D Ground Scan. If you already know where to scan and want the most detail plus a working metal detector, we recommend the eXp 5500. If you are still searching a large property for the right spot, look at the Delta Ranger.
eXp 5500, Best For:
- Wide scan fields in desert or open mountain ground, where five sensors cut the number of passes
- Caves, passages and crevices, using the single Super Sensor
- Teams that want PDF reports and CSV export from the Professional Edition software
Key Features in the Field
OKM says the VLF mode offers multi-frequency operation and target ID zones, with preset and custom profiles, adjustable sensitivity for mineralized soil or scrap, and discrimination of gold and silver from iron and bronze relics. That makes the eXp 5500 the OKM in our range for someone who wants multi-sensor survey imaging and a conventional VLF detector on the same visit.
Scan data goes home with you on the notebook. Visualizer 3D Studio Professional Edition adds PDF reports, CSV export, scan field overlays and extra soil types over the Standard Edition. Reading the images takes practice, and repeat scans of the same area are worth the time: a convincing image is not proof of what is underground, and no color or shape in a 3D image tells you a target is gold.
OKM states that customers have found objects down to 25 m (82 ft) with the eXp 5500 in 3D Ground Scan. OKM gives no test conditions for that figure, and it applies to large objects and voids, not to small metal. Our guide How Deep Do Metal Detectors Go? explains why.
Where It Works Best and Its Limits
OKM lists archaeology, treasure hunting and cavity detection as uses, with artifacts, militaria, treasure chests, cavities, tunnels and jewelry among the targets, and pitches the eXp 5500 for rocky mountain terrain and wide desert areas. It is a dry-weather instrument: move it between sites in the protector case. The full kit is also a lot to carry for a quick look at a small yard, where a conventional metal detector is the faster tool. For non-metal targets such as cavities and foundations, the OKM Gepard GPR uses ground-penetrating radar.
Sensors, Software and Accessories
OKM's eXp 5500 Professional package holds the control unit, the Super Sensor with LED Orbit, four Enhancers, the PentaSense Rod, the 14 x 10 inch VLF PentaCoil, a telescopic rod, carrying strap and backstrap, four protective caps, Bluetooth headphones, a pre-configured Windows notebook, a USB flash drive with Visualizer 3D Studio Professional Edition, a charger, the PP20V3A01 power pack and a waterproof, shock-resistant protector case. OKM lists the Super Sensor at 0.74 kg (26.1 oz) and the PentaCoil at 0.84 kg (1.9 lb). The sensors and PentaCoil are OKM's own; coils made for other detectors do not fit. OKM offers extra software activations and 3D software training for teams that share scan analysis.
Compare OKM 3D Ground Scanners
| Feature | Fusion Light | Fusion Professional | Rover UC | Rover C4 | Evolution NTX | eXp 5500 | Delta Ranger |
|---|---|---|---|---|---|---|---|
| OKM group | Entry-level 3D ground scanner | Advanced 3D ground scanner | Entry-level 3D ground scanner | Entry-level 3D ground scanner | Entry-level 3D ground scanner | Advanced 3D ground scanner | Multi-technology treasure detector |
| Operating modes | 3D Ground Scan, Magnetometer | 3D Ground Scan, Live Sound (magnetometer) | Magnetometer, Pinpointer, 3D Ground Scan | 3D Ground Scan, Magnetometer, Pinpointer, Mineral Scan | 3D Scan, Live Sound (VLF) | 3D Ground Scan, Magnetometer, VLF Metal Detection | Bionic Stream, Ionic Stream, Magnetometer, 3D Ground Scan, Thermo Scan, Thermo Stream |
| Shallow metal coil | None | SRIS search coil, built in | None | None | VLF search coil, built in | 14 x 10 inch VLF PentaCoil | None |
| Control and display | Supplied Android smartphone with OKM app | Supplied Windows notebook; Live Sound through Bluetooth headphones | Supplied Android smartwatch with OKM app | 3.5 inch touchscreen on the control unit | 3.5 inch color touchscreen on the control unit | 8.4 inch touchscreen on the control unit | Supplied Android smartphone with OKM app |
| Depth OKM gives (large objects) | 8 m (26 ft) | 21 m (69 ft) | 20 m (65 ft) | 25 m (82 ft) | 8 m (26 ft) | 25 m (82 ft) | 18 m (60 ft) |
| Weight | About 700 g (1.5 lb) | About 1 kg (2.2 lb) | About 500 g (17.6 oz) | Control unit about 1.5 kg (3.3 lb); probe 0.4 kg (0.9 lb) or 0.9 kg (2 lb) | About 1.5 kg (3.3 lb) | Control unit 1.7 kg (3.75 lb) | Control unit 640 g (22.6 oz); probes 105 to 165 g (3.7 to 5.8 oz) |
| Battery | Li-ion, about 12 hours | Internal, about 12 hours | Built in, 48 hours, USB-C charging | Built-in rechargeable | Rechargeable | Replaceable Li-ion, about 7 hours | Built in, about 24 hours |
| Waterproof | No (IP40) | No (IP40) | No waterproof rating | No | No | No (IP40) | No |
| Warranty | 2 years | 2 years | 2 years | 2 years | 2 years | 2 years | 2 years |
OKM gives most of these depths as objects its customers have found; they apply to large objects and voids, not coins.
Why Buy the OKM eXp 5500 Professional from Serious Detecting?
- Free Shipping on Orders Over $99: Your OKM eXp 5500 Professional ships at no extra cost across the continental US.
- Authorized OKM Dealer: Showroom in Ypsilanti, Michigan, full 2-year manufacturer warranty and product registration support.
- Help Before and After You Buy: Our staff answer setup, software, sensor and eXp 5500 Professional questions by phone or email.
Customer Questions & Expert Answers
Get real answers from outdoor explorers and our product experts. Browse questions about performance, features, and setup —or ask your own to make sure this gear fits your next adventure.
Does the OKM eXp 5500 have a regular metal detector mode?
Yes, the OKM eXp 5500 has a regular metal detector mode: VLF Metal Detection with the included PentaCoil, a 14 x 10 inch VLF search coil. OKM says it offers multi-frequency operation, target ID zones, preset and custom profiles, and discrimination of gold and silver from iron and bronze. It is for shallow targets; 3D Ground Scan is the mode for deep objects and voids. See other 3D imaging metal detectors.
Answered by Dan P. · October 2026
Can you use the OKM eXp 5500 in caves or narrow passages?
Yes, the OKM eXp 5500 can be used in caves and narrow passages with a single Super Sensor, the set-up OKM recommends for caves, passages and crevices. The three- and five-sensor PentaSense set-ups are for wide open scan fields. Keep the unit dry, as OKM rates it IP40 and not waterproof. See the full OKM range.
Answered by Richard T. · October 2026
How long does the OKM eXp 5500 battery last?
The OKM eXp 5500 battery lasts about 7 hours on a full charge, according to OKM, measured at 25 °C with the screen at medium brightness. It recharges in about 3 hours, and the lithium-ion battery is replaceable. Higher screen brightness and cold weather shorten runtime. Compare other deep-search systems in our deep seeking metal detectors.
Answered by John W. · October 2026
What software comes with the OKM eXp 5500?
The OKM eXp 5500 comes with Visualizer 3D Studio Professional Edition on a USB drive and a pre-configured Windows notebook. Professional Edition adds PDF reports, CSV export, scan field overlays and extra soil types over OKM's Standard Edition. OKM sells extra activations and 3D software training separately. The eXp 5500 also has a VLF PentaCoil mode, and our metal detector technologies guide covers how VLF detectors work.
Answered by Dan P. · October 2026
