"many"? yes, there's random internet stories, I'm curious what represents a probe not deep enough. 2m is a shit-ton of avalanche debris to move.
2.4m, 2.8m, 3m, much of a muchness; the longer are more useful for crevasse probing. 3.4m would get to be a bit unwieldly for fine probing a relatively shallow burial. The tech propes w/a ruler on them are useful for pit work.