Need magnetometer info.

[goldseeker928]

Have posted this in the Geo post area,yet no replies. not a well visited site I guess!
Have a Crone JEM magnetometer (1974), and a Jalander handheld magnetometer
(1968), but no manuals available from the companies(still in business) though!
Does anyone have ANY info. on their operation & capablitis(sorry spelling).
Am at a stand still!

 

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[jeff of pa]

Apparently not a well known Device