As indicated, the autoclave is just one of the equipment choices that is used to sterilize the forceps/tweezers and can also be used to sterilize needles however not too many electrologists do this anymore as presterilized single use needles are preferred. Since needles do not maintain their strength and can become dull with repeated use, single use is a better choice as it also eliminates any concerns about potential sterilization problems.
Most electrologists don’t like the idea of handling used needles; we prefer to chuck them in the sharps containter and start with the single use presterilized needle for each appt. The only advantage to reusing needles is the cost savings for the practitioner.
The only way you can know for sure if you are getting a presterilized disposible probe is to observe the electrologist opening a tiny shrink wrapped packet and remove the needle from it, before beginning treatment.