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more info... Geotechnical Gauge   Price: US $16.50   more info... Grain Size Card List price: US $5.00 Price: US $3.00 You save: US $2.00 (40%) Displays Wentworth grain size classifications, sorting, centimeter and millimeter scales. Thick tanslucent plastic. Size: 4 x 2 inches.   more info... Sand Gauge card (vote(s): 2) Price: US $14.30 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.