Item : B000EE8YPK Customer Reviews Good tuner by .. Brandon Murphy () my only complaint with this tuner is the fact that it doesnt have a transpose function, which this is not a big deal at all. I play trumpet, and it picks up on my instrument in all ranges just fine. super easy to use, and really useful. Great, simple to use tuner by .. David B. Spalding (ChromeJob.com) I just bought this tuner to use with my new mandolin, and reviewers here (and a family member) steered me right. The CA-30 and CA-40 tuners are good affordable tuners to support those learning to tune their acoustic instrument. I took a star off for a rather brief manual, and lack of FAQs and such on the Korg site. Though the CA-40 has a built-in stand, it has no backlight, which I would've preferred for dark stages where it could be used with an optional microphone. On the plus side, the tuner is sized to fit in most instrument cases' equipment pocket, which keeps it safe and handy. Don't hesitate on this if the price is still discounted. NOTE: This item has been tagged as a metronome, it DOES NOT feature metronome functions. Still Learning... by .. Michael B. Morris (Tate, GA) I bought this with the hopes of learning how to tune pianos. I've played around with it a little and it seems like it will work well to keep the piano going (at least in between times when the "real tuner" comes.) works like a charm by .. swami D (lost angeles) very cool little tuner...works great with everything i've plugged into it-guitars, basses, my clavinet and analog synths. why i bought really expensive tuners in the past is a mystery... Quick and Handy by .. E. Karr (San Diego, CA) This is a great tuner. It picks up sounds very well and quickly. You could be humming across the room, and it would probably pick it up. It's that sensitive. The little flip-up piece in the back allows it to stand. It is easy to use and easy to read. You just turn it on, play a note, and see if the green light shows up (the left red light means the note is too low, and the right red light means the note is too high). And it's nice that it tells you the note that you're playing. The only thing I wish is that it had a light inside because I have a hard time reading the screen (to see the letter of the note) without proper lighting. It can also be helpful for guitar players because it seems to allow you to keep it plugged in between the instrument and the sound system so you can still play (I'll have to look at those instructions again!).