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Piston Extension Set for Field CBR Test properly positions the CBR Penetration Piston for California Bearing Ratio (CBR) field testing. Extensions allow extra flexibility when the setting distance between the loading jack base and soil surface. The kit contains one 36in (914mm) tube, one 24in (610mm) tube, three 12in (305mm) tubes, two 4in (102mm) tubes, and two 1.5in (38mm) tubes.
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