For me, as a layman, it was only times questionable how true. Therefore, I have read in the Bedinungsanleitung ... here are 7 strings of a guitar ... but it has only 6!? But I hmm thanks to the invention, the internet did I then found the right voice meadow, on the side of the dealer where the Tuner bought. Thus, a plus for help via Internet ... but a minus for customers who do not have internet! The scale varies and reaches its ideal value for a short time, that is, be careful when voices else thinks you can have the right tone not found. The tuners I know, it was clear whether is in tune, because the needle was not permanently in movement. All in all I am satisfied and can make use of the device!