This is a guide to help classify soils into sand, silt or
clay. It is a flexible, waterproof 5" x 7" plastic card with a
nylon lanyard that contains miscellaneous data for soils use.
Printed on both sides, the gage features: roundness chart;
chart for estimating percentage composition; unified soil
classification system; six common Munsell soil colors; soil
compaction tests for clay and sand, shear strength ranges; and
size classification with actual sand grains from coarse to
silt. Sand grains and color chips are permanently fused to the
501-027 Geotechnical Gage 0.8 lb.