Gauge Classifies Sand from Coarse to Silt
Flexible, water-resistant plastic card helps you determine size classification, bed thickness and roundness of sand granules. Sand Gauge includes field checklist to organize field notes; geologic time scale; two carbonate classification charts. Actual sand grains are fused to the plastic.
3-1⁄2"H x 2-1⁄2"W with lanyard.