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Combination Permeameters are more economical and allow granular samples to be tested by either the constant-head or falling-head methods, but do not strictly meet ASTM and AASHTO requirements. Construction and chamber sizes are similar to the ASTM/AASHTO Permeameters, but they are not equipped with sidewall manometer ports. Constant-head reservoir, scale, manometers and all necessary tubing are included.
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