I bought the device online and tried it at home. I was satisfied with the results. I would only borrow it from someone first if I had lighter hair because in that case the results may not be as satisfactory. Greetings

Testing it in the shop won't do any good because it takes repeated applications for the hair growth to decrease. It works very well for my wife because she has black hair and relatively fair skin. I hardly noticed any effect on myself because I have light blonde hair.

I also ordered the device online and tried it right away. It works quite well on thinner hair and fair (normal) skin. I also wouldn't have known where to test the device.