I'm still figuring out how this works. I have chronic fatigue syndrome with myofascial pain/fibromyalgia, and I have a micro-current unit (like a TENS unit) that i use to "melt" my trigger points. But the electrodes can itch, and sometimes i want to move them around, especially since i have pain all over my body. So i got this pen to use instead.
I've kept it at the lowest, micro-amp frequency settings, mostly because I don't know if it will cause problems at higher settings. I've used it to find points, then do acupressure on them.
The hand-held metal piece that comes with it is to be used when someone else is treating you. My husband did not have luck with this, so I can't say how well that part works. But for use of the pen alone on myself, where I already KNOW the pain is, or may be originating, it is useful. It also comes with a smaller tip that can be used for points on the ear.
I've used it mostly on my fingers/hands, toes/feet to balance meridians and I seem to be progressing with my overall healing.
UPDATE: Feb. 2011.
I still keep mine mostly on the lower frequencies, lowest intensity, lowest sensitivity, since I have so many trigger points (it detects points EVERYWHERE.) But they are getting better. I have yet to figure out what the plus/minus is for. I'm not a student of Chinese medicine, but I apply the pen where it hurts, or around the sore area, or just on the ends of the muscles. At first I was afraid and just used it on my fingertips/toes. But now I use it on my limbs, my back, my belly, my face, etc.
I have a chart for meridians, etc. and sometimes I follow along them, but it's not necessary. The beauty of this instrument is that it TELLS you where the points are...acupoints, trigger points, etc. Any over-stimulation (acupressure/puncture/massage) is going to make a person feel ill. I have found an increase in my chronic fatigue symptoms if i do extensive energy work throughout my body, but after my system 'flushes out' the toxins that have been released (it takes a few days,) I feel a lot better.