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The BCA Polycarbonate Crystal Card is small but mighty. It's marked with 1, 2, and 3mm grids that make it to easy to sort and classify different snow grains, and is made from a non-heat conducting material, allowing you to study those snow crystals for longer.
Polycarbonate Crystal Card
Lexan – Material does not conduct heat, which keeps the crystals from melting.
6 x 4 in / 15 x 10 cm
1, 2, and 3 mm Grids
Protective Clear Coat
Crystal and Snowpit 'Cheat Sheets'