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Geotechnical Gauge is a water-resistant 5x8in (127x203mm) plastic card on a lanyard and has a wealth of information for classification of soils. Six color chips, four patches of sized grains, and four tables assist in classifying:
• Soils by particle size using the Unified Soils Classification System.
• Coarse and fine grained soils into fifteen descriptive categories from gravels and sands to silts and clays.
• Sand by type from very loose to very dense.
• Clays from very soft to hard.
Categories are defined by appearance, by handling properties, or by ranges of field and laboratory test results. Edges of the card have separate 0—6in and 0—110mm scales.
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