An excellent tool for viewing snow crystals in the field, the Brooks-Range
Folding Magnifier X10 folds flat for excellent storage.
Opens to 1.875" x 1.5" x 2.25" (4.76 x 3.8 x 5.7 cm), folds to just over a half-inch high
Uses a one-inch glass lens for distortion free viewing
Inch and millimeter scales on the perimeter of a 1-inch square viewing area