Drexelbrook Controls, Inc.

Edward R Woerner

Frederick L Maltby

Steven R Petersen

Thomas E Meacham, Jr

A probe comprises a plurality of longitudinally extended conductors forming a probe electrode, a laterally displaced ground electrode and two laterally displaced active guard electrodes interposed between the probe electrode and the ground electrode. The conductors are surrounded by solid insulation and the probe guard electrodes are driven at substantially the same potential as the probe electrode. The probe is utilized to measure the condition of materials in which the probe is immersed.

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North Wales, PA, United States of America

Edward R Woerner