Our Brooks-Range Grid Card provides a stable base and expansive grids for examining snow crystals. Uncluttered with only large areas of the 1 mm, 2 mm and 3 mm grids to determine crystal size and shape. This handy black screen simplifies snow crystal analysis.

During production, the high quality aluminum is partially textured and then anodized flat black for oxidation, contrast and for easy crystal identification. The metal has low thermal conductivity to minimize melting and preserve the crystals.

The large areas of the 1 mm, 2 mm and 3 mm black background grids provide excellent viewing of various snow crystal forms. Because each grid has a textured surface, crystals stay put and a degree of relief is achieved. The millimeter grids easily allow estimates of crystal size.

Sized at approximately 4.6" x 7", it will easily fit in your field book, pocket and the Brooks-Range Field Organizer. Inclinometer string and instructions included.