I have a dumb question!

Last weekend, my chiropractor let me use her laser which is FDA approved for brain scans and for pain. However, there are a lot of frequencies available for different ailments and for killing parasites. The chart is similiar to other frequency charts that I've seen for Clark, FScan, etc.

I had asked why are there 8-10 different frequencies for ascaris. She couldn't give me answer that was really satisfactory. "I don't know why there are so many, I was told to do a kinesology test to see which frequencies work best on that person." Since I don't believe in the effectiveness of kinesology, the answer wasn't very helpful. I also don't understand how a person can have a piece of equipment for a couple of years and not understand every aspect of its functions!

I also haven't found anything on the net describing the purpose of so many frequencies for one worm.

So my question is, why are there a lot of frequencies for one worm? How do you know which frequency really works or doesn't?