Whether you're taking an Avalanche Safety course or habitually digging pits, you can benefit from the Brooks Range Folding Ruler. If you need more than a meter of length because the snowpack is deep, Brooks Range's 200cm ruler is the obvious choice. It also has enough markings to get precise in your studies. Folds down to a mere 9¼” (23.5 cm) in length. Each section snaps to right angles, or in-line. Red highlights mark every 10cm on the metric side and every foot on the imperial scale which lets your quickly and accurately measure the layer depths.