The GSMP-35 family of potassium magnetometers and gradiometers are the most precise magnetometers available on the market today, the result of years of development that have brought sensitivity to values of 0.0003nT@1Hz. Optically pumped potassium technology allows for measurement of even extremely high fields (greater than 250,000 nT for the High Field option).
The system is available in various configurations: single sensor, gradiometer, for stationary and walking measurements with optional integrated GPS.
