All user reviews for the Korg DT-10

I had it twice, on two different pedal boards.

I tried out many other products: Boss, Arion, Korg and others
I like the reliable display and the latency time. It reacts slowly, which doesn't mean that it doesn't work well, but it doesn't recognize all harmonics which can appear by resonance, and this is a very good thing.
When you're on stage, nothing is more annoying than a tuner which continuously moves: you never know if you are in tune or not!

I would buy it again. I kept one of the two I had because I'm satisfied with it. I sold the second one because I didn't use it anymore.
Today, I would like to try out the TC tuner which seems to be really great. And we all know the quality of TC gear. However, the DT-10 is still a good product.
It's not too big (a bit larger than the Pitchblack or the TC). Mute function, battery or PSU (9 V DC) operation. Easily readable on stage, even with blinding lights.
Also available in rack version, if you have a guitar tech... but I just like the stomp box version.

Originally written by jelly.roll on Audiofanzine FR.

This is a high quality tuner from Korg. It is a pedal tuner which makes it useful for live gigs. This tuner has a bright, clear display, easy to see in dark rooms. It's superbly accurate as well. It has a wide range, and can be adjusted via a button to drop the strings down several half steps for alternate tunings. It can be used with either a 9V battery or a 9V power supply. It has one 1/4" input and two outputs, one normal and one bypass. This gives you the option of muting all of your tuning excursions, or broadcasting them through the amp. I personally never use the bypass option, but it could be cool if you're going direct as well as through an amp.
While this amp has certain cosmetic advantages, I'm not sure I would put this over the Boss tuners. The only reason being that those pedals have the ability to provide a daisy chain power supply to other pedals. This pedal does not have that option. While it doesn't seem like a big deal, it works very well in my experience. Granted, I do think this tuner is easier to use, and possibly more accurate, but that power supply thing is a deal-breaker for me. I think that the best use for this pedal is if you already have a pedal board with a power supply, or have some alternate source of power. I'm sure there are many players out there with this capability so I can recommend this tuner to all of you!
I guess ultimately the power supply issue isn't as important as accuracy, and flexibility, and the seven semitone flat capability that I discussed before is a pretty big deal. Therefore, I can highly recommend this to anyone who isn't relying on their tuner for power.