Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Can either end of this (brush or disc) be used on the SENSOR in my Sony NEX 6?
Document: I never used any fluid either. That in itself is a pleasure.Cons - mine came only with instructions in Nipponese. Sorry, I lose it with the Greek alphabet, much less the complex Japanese symbols. However, Nikon drops the ball by having no cap on the brush end of the pen; the brush has a push pull/in out device on the side of the pen.
This one is pretty straight forward. It would have to either work or not. It works. I like the cap that keeps the dust off the brush when it is not being used.
1. with one end, extend the brush, and wipe debris away.This item is on sale for $6.49 and you are not going to beat this price for Nikon quality.The pen has two working ends. On one side you have a brush (very soft so it will not damage the lens) to remove debris from the lens,,while the other side has a pad that polishes away finger prints and smudges.
The Nikon Lens Pen works so much better than a $5 cleaning kit I had. I used to spend minutes cleaning my camera lens with the cleaning solution and microfiber cloth because the solution dried quickly and was hard to get rid of. The cheap-looking brush didn't work well either.With the Nikon pen, it is a breeze. The brush wipes off dirt effectively. The cleaning head cleans the smudge in seconds. It really works!
I used it a couple of times, not exactly that useful. I'm not sure whether all of them are like this or just the one I bought. Its just too dry, and twisting the cap doesnt help either. I'm not using it anymore, scared it might scratch the lens..
I've used this on all my cameras, even my point and shoots, like my canon elphs. The tip is meant for bigger lenses however. I use this primarily for my Sony A55V DSLR. I have not experienced any problems with this scratching my lens or anything else to that matter.It is a great small lens cleaner that I keep in my camera bag for any occasion.
This is a easy to use lens cleaning device.You use the bush end to remove any debris from the lens, and the pad end to remove fingerprints and the like.The bush is retractable and soft enough not to damage lenses.The pad is treated (coated) in such a way as to remove fingerprints without leaving smudges.I have had excellent results using the Nikon Lens Pen on my Sony DSC F-828 digital camera.
It seems apparent there is some kind of black dye in the cloth tip or something along those lines (I found nothing in the paperwork to suggest this was normal), either way I do not think you want to use anything on glass that leaves a mark. Especially since it was not that easy to wash off of my hand let alone anything else.Very strange, needless to say that part of the pen will not be used by me anytime soon.
I have used the pen numerous times on a shoot. It is easy to use and makes the removal of bits of dust pretty painless.In reading the other reviews, I was surprised to note the price complaints, but when I reviewed my order from Feb 2006 I saw that I had paid $6.99 for it. Now that it is $21.90, I cannot recommend it as highly. For that money, it is better to invest in a professional lens care kit.
This is most useful because it's there when you need it. The carbon-implanted disc and the brush make short work of grease and dirt.
Answer: Yes you can use on the sensor... the sensor in all DSLRs is covered by glass... you're not touching the actual sensor.  That being said you're best using an anti static brush and wet clean only if needed.