Displays Wentworth grain size classifications, sorting, centimeter and millimeter scales. Thick tanslucent plastic. Size: 4 x 2 inches.

Munsell® Color Geological Rock-Color Chart 2009 Revised Washable Edition

Compact 2-1/2 x 3-1/2" gauge is loaded with sand specifics including: size classification for large clasts; size classification from silt to very coarse, with actual sand grains; roundness chart with actual grains; bed thickness classification; field checklist to organize notes; geologic time scale; and two carbonate classification charts. Flexible and waterproof plastic card includes nylon lanyard, with sand grains fused to plastic. Shipping wt 8 oz.