An opaque, plastic 3" x 5" card for avalanche forecasting and advanced snow study. 1 & 2mm grids for identifying grain types within the snowpack Back of the card is a quick description of how to dig a hasty pit & definitions of the ...

An opaque, waterproof plastic 3" x 5" card with 1 & 2mm grids and examples of ten basic snow crystal types. On the back are a few useful hints concerning avalanche forecasting.