SOS AVALANCHE PROBE: Designed from 12mm aluminum tubing, the SOS probe utilizes a quick-release ratchet locking mechanism for rapid set-up that wont be affected by adverse weather conditions. Comes with a sturdy packcloth carrying case. You can also add the SOS Probe Tape to your probe for an accurate cm scale right on the pole. Easily applied, the Probe Tape assists with snow surveys and judging layer depth. Another innovation from SOS.