Instruments we trust enough to put our name on

Utility & Infrastructure GPR

PinPointR

Dual-channel utility GPR

Developed specifically for utility detection and infrastructure inspection, the PinPointR combines ImpulseRadar’s RTS architecture with a dual-channel antenna in a compact cart form factor. The Android-driven interface keeps field workflows straightforward without sacrificing data quality.

Versatile Geoscience GPR

CrossOver Series

Multi-frequency professional system

Designed for the professional geoscience community, CrossOver is available in three housings and six frequency configurations from 70 MHz to 800 MHz. True dual-frequency antennas are wireless and self-contained — no trailing cables to damage or replace. The system can be pushed, pulled by hand cart, or towed by vehicle at any speed, and runs up to seven hours on a single charge.

High-Speed 3D GPR Array

Raptor & Raptor Mini

Multichannel array — vehicle & cart

Raptor is ImpulseRadar’s multichannel 3D GPR array, capable of data collection at speeds exceeding 130 km/h at 5 cm point intervals — eliminating the need for traffic control on road projects. The Raptor-45 (450 MHz) suits utility mapping, archaeology and railway investigations; the Raptor-80 (800 MHz) targets higher-resolution applications such as roadbed layers and concrete slab assessment. The Raptor Mini brings the same RTS 3D capability to a pushcart format for sites where a vehicle-mounted system cannot operate.

Broadband EM Sensor

GEM-2 Ski

Multi-frequency handheld & UAV EM — Geophex’s flagship

The GEM-2 measures apparent electrical conductivity and magnetic susceptibility of the ground and detects buried metal and voids, with a powerful transmitter and wide coil separation reaching investigation depths of up to 10 m. Its defining capability is frequency programmability: the operator selects up to ten simultaneous frequencies across the full 30 Hz–93 kHz band, tailoring the response to target type and soil conditions — or mimicking the coil geometry of legacy single-frequency instruments, effectively replacing several sensors with one. At 3.6 kg it deploys handheld or as a UAV payload with the optional UAV kit.

High-Power Broadband EM

GEM-2H

Extended-power variant for deeper or noisier ground

The GEM-2H is the higher-power evolution of the GEM-2 platform, with customer-adjustable operating frequencies spanning 30 Hz to 96 kHz. The increased transmitter moment improves signal-to-noise in conductive or electromagnetically noisy environments — urban brownfields, coastal plains, industrial sites — where standard-power EM instruments begin to lose resolution at depth.

Concentric-Coil EM Sensor

GEM-3 & GEM-3R

Handheld disc & cart configurations

The GEM-3 packages the same electronics and firmware as the GEM-2 into a concentric, coplanar coil head — a symmetric geometry prized in UXO and metal-detection work for its stable, well-characterised target response. It is available as a handheld disc for detailed sweeps and as the GEM-3R, a scaled-up pushcart configuration for higher-productivity coverage of larger areas with the same multi-frequency capability.

Multi-Sensor EM Arrays

GEM-3 Array & GEM-5 Array

Flat-panel arrays for wide-swath coverage

For programmes where survey productivity and positional consistency matter — munitions response, corridor clearance, large-area site investigation — the GEM-3 configuration scales into a flat-panel array: a single large transmitter coil surrounding multiple receivers, collecting several sensor channels in one pass. The GEM-5 Array extends the same array concept on Geophex’s newer sensor generation. Arrays can be vehicle-towed or platform-mounted depending on the site.

Special Platforms & Custom Builds

Robotic · Marine · Airborne

GEM sensors beyond the standard configurations

Geophex has a four-decade track record of adapting its sensor platform to non-standard carriers. GEM-2, GEM-3 and GEM-3 Array instruments have been integrated on robotic ground vehicles; waterproofed variants operate in shallow-water and surf-zone conditions; fully custom undersea sensors are built to application from standard components; and the GEM-2A is the company’s programmable broadband airborne EM instrument for geological investigation. If a survey problem does not fit a catalogue product, Geophex engineers a configuration that does — and we manage that specification process on our clients’ behalf.

Overhauser Magnetometer

GSM-19 / GSM-19G

Ground — single & gradiometer

GEM’s Overhauser platform offers data quality approaching cesium magnetometers at a substantially lower investment. It is available in total-field (GSM-19) and gradiometer (GSM-19G) configurations, with optional walking mode, integrated GPS, and simultaneous VLF-EM capability. Robust and field-proven, this is our standard recommendation for archaeological survey, environmental screening, and general-purpose exploration where potassium sensitivity is not required.

Potassium Magnetometer

GSMP-35 / GSMP-40

Ground — highest sensitivity available

The GSMP-35 is the most sensitive commercially available ground magnetometer, with sensitivity exceeding conventional cesium systems by an order of magnitude or more. GEM remains the only commercial supplier of potassium magnetometer technology. The potassium spectral line is narrow and stable — producing far fewer dropouts than cesium and consistently higher-quality gradient data. The GSMP-40 extends these characteristics to the next generation of higher-performing sensors. Available configurations include single sensor, gradiometer, walking mode, and the “IronMag” high-field variant for urban environments with extreme magnetic noise.

UAV Magnetometer

DRONEmag™ GSMP-35U / 25U

Airborne — UAV & AirBIRD configurations

GEM developed the DRONEmag as the first lightweight, high-sensitivity magnetometer built specifically for unmanned platforms. The sensor electronics weigh under 1 kg in total, deliver potassium-class sensitivity, and support sampling rates up to 1000 readings per second. Available as a slung sensor, integrated into the AirBIRD towed system, or the AirGRAD gradiometer, with Pixhawk autopilot integration available for full multi-parameter data logging.

Observatory & Geohazard

SuperGrad GSMP-20S3

Three-axis potassium gradiometer

Originally developed in response to the US Geological Survey’s need for an ultra-high sensitivity magnetic gradiometer, the SuperGrad measures magnetic gradients simultaneously along three axes using potassium sensors with gradient cable lengths up to 300 metres. It is the highest-sensitivity commercial gradiometer available. Applications include seismic and geohazard monitoring, volcanology, ionospheric research, and observatory installations.

Observatory Scalar Magnetometer

EuroMag GSM-90

Long-term continuous monitoring

The GSM-90 EuroMag is a scalar geophysical instrument designed for continuous, long-term monitoring at a fixed location. Based on GEM’s Overhauser technology, it offers high absolute accuracy, very low long-term drift, and is engineered for unattended remote operation. The GSM-90F variant adds improved stability for the most demanding observatory installations. A standard choice for geomagnetic observatories, geohazard monitoring networks, and reference base station deployments during aeromagnetic and ground surveys.

Airborne Magnetometer System

AirBIRD GSMP-35A / 25A

Fixed-wing & rotary-wing towed bird

The AirBIRD is GEM’s complete towed-bird airborne magnetometer system, built around the high-sensitivity optically pumped potassium sensor. It integrates the magnetometer, GPS, laser altimeter, IMU, power supply, and a real-time radio data link into a single deployable package. Suitable for fixed-wing, helicopter, and large UAV platforms. The GSMP-35A offers an order-of-magnitude sensitivity advantage over conventional airborne optically pumped systems, with the lowest heading error and highest absolute accuracy available for aeromagnetic survey work.

Portable Field Gravimeter

GAIA-FIELD

MEMS VBA — next-generation field gravimetry

GAIA-FIELD is SMG’s flagship portable gravimeter for terrestrial surveys. Its active gimbal system and VBA MEMS sensor deliver measurement resolution below 1 µGal with a standard deviation below 5 µGal at 180 seconds — performance previously available only in much heavier, more fragile instruments. Onboard real-time corrections for tide, drift, temperature and Bouguer offset reduce post-processing time significantly. Fully sealed to IP68 and rated from −20°C to +45°C, it has been field-proven in Australia, Wales, and multiple defence trial environments.

Why MEMS Gravimetry

The technology gap SMG closes

Traditional spring-mass gravimeters (Scintrex, Lacoste & Romberg) are mature but mechanically fragile, temperature-sensitive, and require careful levelling procedures. Quantum gravimeters offer exceptional absolute accuracy but remain laboratory instruments costing an order of magnitude more and weighing tens of kilograms.

SMG’s VBA MEMS sensor occupies the gap: it achieves sensitivity competitive with the best field spring gravimeters, in a 5.5 kg system that auto-levels in under 10 seconds and acquires a reading in 30–90 seconds. Onboard drift, tide, and thermal correction reduces the skill barrier for field teams without compromising data integrity.

For defence and dual-use applications, SMG’s UK Defence Innovation-backed programme demonstrated detection and mapping of buried anomalies — including tunnels and underground voids — using this technology.