Careful about the 'probe in the shovel' combination. Buried people have been excavated alive at 2.3m. Most of the probes that can fit in shovels are less than 2m long. Unless you plan to bend down and dig a hole you could possibly miss a recoverable victim.
Also, read the directions for these rather delicate probes....'push gently into the snow'.
Hmm....we have seen full diameter probes be bent on avalanche slopes.
When purchasing a probe, take a look at the diameter, the amount of flex (you want sturdy), and the length (3.2m is common). Size matters boys!!
You want a probe with enough cable so that when the probe is folded down that the sections are not rubbing on the cable and causing it to fray. Also, take a look at the closure. Consider reliability in cold weather and if moisture could freeze some of the working parts. Fine threads can get filled with snow and some styles have the top section that slides over an upper shaft. This commonly freezes together and renders the probe useless.
One more thing, check to see how easy it is to take up slack if the cable gets stretched. If the probe is loose when assembled, snow can get jammed in the sections and it can easily get broken. Hope this helps.
Read the article that RGM posted. It is worth the read!