| The R-4 is a magnetic extensometer system used to measure settlement or heave in engineered backfill structures (dikes, earthfill dams, road foundations) or in natural slopes or embankments. The system consists of an access pipe or standpipe, anchor magnets and a portable reed switch probe. It may be used with inclinometer casings (70 or 85 mm) to obtain both lateral and vertical movement profiles or with standard PVC access pipe (33 or 48 mm). |
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