Geotechnical Gauge
Description:-
Geotechnical Gauge is a water-resistant 5 x 8in (127 x 203mm) plastic card on a lanyard and has a wealth of information for classification of soils. 
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.
Six color chips, four patches of sized grains, and four tables assist in classifying.
Clays from very soft to hard.
Edges of the card have separate 0-6in and 0-110mm scales.