Ortovox 320+ Steel Pro pfa Probe 2012: Within seconds you are ready for backcountry safety. The ORtovox 320+ Steel Pro pfa Probe is the choice of rescue organizations everywhere because of its pfa quick-release tensioning system that stretches using a sturdy steel cable pull line. The steel segment diameter of 12 mm makes the Steel Pro extremely resilient and rigid. It is delivered with a length of 320 cm, but can be extended using additional segments.