Bell-4190 Gaussmeter   $ 567.  
Bell-4080 Triple-Axis ELF Gaussmeter, with instruction sheet and free Magnetic Field Guide
Bell-4190
Three-Axis Gaussmeter
This compact  handheld gaussmeter is similar to the Bell-4180   with added features for the professional and  technical user. 

The 4190 provides 1999 mG range, Analog Output,  and a USB Port with Software for Data Logging. 

To see features and specifications:  click here. 

To see information on the USB port: click here

To see the full instruction manual: click here
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This meter measures AC magnetic fields. It does NOT measure static or DC fields, such as magnets, magnetized metal, or the earth's magnetic field.