I was not happy with this purchase. The screen is very dim, making it hard to see if you use it outside. Also, if you use a different instrument, such as an oud, or a mandolin, the tuner shows weird results (such as a D instead of a C#) which is odd. The manual stated that the screen changes colour when the instrument was tuned, but mine didn't. I'm unsure whether this is an issue with this one specifically, or if it's the whole range. I didn't like it; but, following Tao, decided that since it works in dark areas, and the guitar tuning works much better than the chromatic tuning I need, I gave it to a young guitarist who plays in a darkish training room. He was pretty happy with it, and for less than 4 euro, it's not worth complaining. about something that works during the right circumstances.