Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Korg CA-40 Tuner

Seems to be accurate. I do not have to fine tune the guitar after using it like I did with my old tuner. Is easy to read considering my declining eyesight. Wish it had a backlight but other than that it is an excellent buy for the money. In fact, I may even buy another one for my backup guitar.