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Sand Gauge
For classifying sand from coarse to silt.Flexible, water-resistant plastic card helps determine size classification, bed thickness and roundness of sand granules. Includes field check list to organize field notes; geologic time scale; two carbonate classification charts. Actual sand grains are fused to the plastic. Dimensions:3 1/2"H x 2 1/2"H x 2 1/2"W with lanyard.
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