The 3.16 version of Grad601 is provided as a free download on our website. The software relates to Education Tools. The actual developer of the free program is Bartington Intruments. The most popular version of the program is 3.1. The program's installer is commonly called Grad601.exe.
From the developer:
The Grad601 is a single axis, vertical component fluxgate gradiometer comprising a data logger, battery cassette and either one or two Grad-01-1000L cylindrical gradiometer sensors mounted on a rigid carrying bar. Each sensor contains two fluxgate magnetometers with one metre vertical separation.
The system provides a good depth response with its one metre baseline, along with exceptional stability.
You may want to check out more software, such as Snuffler, which might be similar to Grad601.