If your practitioner is using insulated probes, they are single use. Although one could buy reusable stainless steel and gold probes, resterilize them between uses, and treat the next client, the nature of insulated probes is that they must be disposable. The insulation is not resterilizable, and tends to break down from use and flake off. Even with stainless and gold, the probes tend to break down after a number of uses, but an insulated is usually toast after just one use. I have had to change them out in the space of one treatment, but then again, I have an average treatment time of 3 hours, so my results are not typical.
You have most likely misunderstood when she said something like, “I have disposable stainless steel and insulated probes” to mean that one was single use, and the other reusable. I am sure that both are single use. At least until one is comfortable with one’s electrologist enough to not be checking up on their every move, most electrologists make a point of showing you the moment when they break open a package to insert your probe in the probe holder on the machine so you know it is brand new. In some states this is a legal requirement each and every time one has treatment. You will find that 99.9% of electrologists are using disposable probes (rather they are disposing of them after one use or not) because it is just too expensive and time consuming to purchase the reusable one’s, clean and resterilize them, and deal with the client’s reluctance to believe that you really have done so.
Just for the record, you don’t want to just store a probe used on you and reuse it later. Even overnight the build up of bacteria and germs would pose a health risk. Did you know that most bodily fluids, when properly fermented create lethal poisons?
In the unlikely event that your electrologist IS using reusable probes, (or reusing disposable ones) you have the perfect right to request that she buy you a box of your favorite probes (have her try out stainless, insulated, and gold on you to see what you find most comfortable) and just use your own every time you come in. Hint, most of my clients find the Ballet Gold Probes to be the most comfortable.