Hello!
I have a Sterex SX-B and a Student Epilation Kit.
My question:
Is it possible to use a probe/needle several times (over a couple of days) and If yes, is it enough when I desinfect the probe after each session and let it stay in the needle holder, packed in a plastic bag?
If it is not possible then … why?
I want to test it on myself so don’t think I want to use the same probe for different people 
thanks a lot
Norman
As long as You do not use insulated probes You can even sterilize them. Occasionally, I do that with the probes i use to epilate myself without problems. Of course, my customers always get a fresh probe on each treatment.
The probe is just a piece of steel. If i were You i would remove it from the needle holder and pack in in a small glass - better protection; it can be easily reinstalled in the needle holder with the tweazer. A plastic back is useless, the danger to damage the probe during packing or unpacking is massive.
But be aware that probes wear out, and that they wear out faster in DYI epilation. So recconsider what You are doing.
Beate
I reuse a probe (on myself) several times. I sterilize the probe along with my forceps etc. The larger the probe, the longer it will last (resist any bending, and won’t be “eaten” as fast.) I mostly use size 6 needles and can get 5+ treatments out of them; the smaller size 4 needles I started with didn’t last more than two treatments.
(Folks I practice on get a new needle every time of course.)