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Description of Null Indicator
Used as a balancing device to measure the pore pressure of the specimen, it avoids any flow of water inside or outside the sample. The unit is made from acrylic material, and is realized in one piece only; assembled on the triaxial cell, avoiding eventual tubing expansions.
AASHTO T216 ASTM D4546 ASTM D3877 ASTM D2435 BS 1377:5
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