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Geometrics G-856 Mag

G-856 Magnetometer

The G-­856 provides a reliable, low cost solution for a variety of magnetic search and mapping applications. Single key stroke operation means the G-­856AX can be operated by non-technical field personnel or used in teaching environments. The G-­856AX uses the well proven proton precession technology, allowing accurate measurements to be made with virtually no dependence upon variables such as sensor orientation, temperature, or location. The unit provides a repeatable absolute total field magnetic reading, traceable to the National Bureau of Standards.



The principle application for the G-856AX is as a base station system for monitoring and recording of the Earth's diurnal magnetic field variation. These base station measurements are downloaded into MagMap2000 for automatic correction of G-856, G-858, G-859 or airborne survey data. Base station accessories available for use with the G-856 include external power cable and base station tripod kit.

The G-856AX is also used in mapping geological structures, for mineral exploration, magnetic search for industrial, environmental or archaeological targets. The optional gradiometer attachment gives greater resolution and noise immunity for conducting searches in industrial or high cultural noise environments. Simple operation, large digital data storage capability, and the inclusion of MagMap2000™ data transfer and editing software provides a system well suited for both teaching and survey applications.

A thoroughly well proven design (over 2,500 units sold), excellent performance and the lowest price professional system are key features of the G-856AX. Combined with the ease of use, user friendly download/editing software, and readily available commercial contouring programs, the G-856AX represents a complete magnetic surveying package generating high quality data for budget conscious users.


Resolution: 0.1 nT
Accuracy : 0.5 nT
Clock: Julian date, accuracy 5 sec per month.
Tuning: Auto or manual, range 20,000 to 90,000 nT
Gradient Tolerance: 1000 nT/meter
Cycle time: 3 sec to 999 sec standard , can be manually selected as fast as 1.5 sec cycle time.
Read: Manual, or auto cycle for base station use.
Memory: 5700 field or 12500 base station readings
Display: Six digit display of field/time, three digit auxiliary display of line number, day
Digital Output: RS-232, 9600 baud.
Input: Will accept external cycle command.
Physical Console: 7 × 10.5 × 3.5 inches, (18 × 27 × 9 cm) 6 lbs (2.7 kg)
Sensor: 3.5 × 5 inches ( 9 × 13 cm) 4 lbs (1.8 kg
Environmental: Meets specifications within 0 to 40 C
Will operate satisfactorily from -20 to 50 C
Power: Rechargeable, magnetically compensated Gel-Cel batteries

Standard Accessories

Sensor, Staff, Chest Harness, Two sets of batteries, RS-232 cable, Operations manual, Applications manual, MagMap2000™ software


Gradiometer attachment. External Power/sensor lead, External power/RS-232/sensor lead, rechargeable battery and charger set