Grad601 Single & Dual Sensor Magnetic Gradiometers

For Shallow Geophysics and Archaeological Prospecting

Grad601 Datasheet

The Grad601 is a vertical component fluxgate gradiometer with data logger and either one or two cylindrical sensor assemblies for use in geophysics and archaeology. Each sensor assembly contains two fluxgate magnetometers with a one meter vertical separation together with electronics and non-volatile memory for calibration data. The system provides an enhanced depth response, exceptional stability and electronic adjustment.

To place an order or for more information on this product please fill out the form below.

Grad601 Single & Dual Sensor Magnetic Gradiometers

The Grad601-2 two-sensor version is designed for archaeological prospecting and allows geophysical surveys to be completed in about half the time. The large non-volatile flash memory and fast downloading of data offer improved survey efficiency.

The Grad601-1 single sensor version is ideal for both archaeological prospecting and the location of pipes, cables, drums and archaeological features.

These gradiometers have a linear range of 100nT with a resolution of 0.1nT and a range of 1000nT with a resolution of 1nT. A compressed response is provided to 30,000nT.

The exceptional temperature stability of the sensors ensures minimal drift during surveys and reduces the need for adjustment. All adjustments are accomplished automatically using a single pushbutton and audible cueing.

The Grad601-1 and Grad601-2 gradiometers are supplied complete with cables and accessories in a rugged carrying case. The Grad601-2 dual gradiometer includes an adjustable harness which completely relieves the operator’s arms whilst carrying the instrument.


  • 1m vertical spacing for deep anomalies
  • 1 or 2 sensor operation
  • High stability and simple electronic adjustment
  • Selectable 0.1nT or 1nT resolution
  • Non-volatile flash memory for 125k readings
  • 1, 2 or 4 lines/m for single or dual version
  • 1 to 8 readings/m on each line with automatic averaging or single shot
  • Low power – 24 hour operation from one charge
  • Survey and Scan modes with audio output
  • Battery unit has built-in charger and field replaceable battery
  • Battery fuel gauge
  • Variable survey pace
  • Variable scan threshold
  • Simple download operation – 6.5 mins max
  • Selectable output format
  • Simple 6-key operation
  • 50/60Hz powerline rejection

The gradiometer operates either in survey mode, where data is logged whilst covering the site in parallel or zigzag paths, or in a scanning mode where it is used as a search tool with an audible output without data logging. The scanning mode is used to locate archaeological features, pipes, cables, waste drums and unexploded ordnance.

There are no reviews yet.

Be the first to review “Grad601 Single & Dual Sensor Magnetic Gradiometers”

Your email address will not be published. Required fields are marked *