Korg OT120

EDIT to my original review:

I have purchased two of these tuners from Thomann. Within about three and a half years both stopped working properly.

On one of them the needle stopped moving. It still works, but with just those two LEDs it's not precise enough for adjusting intonation, which is what I specifically got this tuner for.

On the other one the needle stopped moving too, and in addition to this the mic also stopped working, which means it can now only be used with electric instruments. This one has only been used sporadically at home, and has mostly been stored safely in a drawer.

The first one (where only the needle stopped working) had seen almost daily use in a guitar guitar workshop, but still... It has been treated carefully, and I expect a tuner to last significantly longer. We have a very similar Korg GT-120 tuner (now discontinued) at the workshop that must be close to 20 years old and still working perfectly. I've also got a Boss tuner that has been mistreated for close to 30 years on my pedalboard and it is still working perfectly.

Sorry Korg, this isn't even remotely acceptable. The quality of your products isn't what it used to be. I will definitely never buy this model again.

My original review follows unedited below (they ARE good tuners when they are working properly, but sadly they don't seem to last very long):

This is my favorite studio/workshop tuner by far! Excellent for doing setups/intonation. The needle is much easier to work with than any LED or strobe tuners. The various modes makes it really flexible too. It works great both with mic and jack and responds very nicely to all instruments I've tried.

Of course this isn't a stomp box so it's not really suitable for a pedal board but for studio use or doing setups in a guitar workshop it is absolutely superb.

I've tried pretty much all of the most popular tuners and this one makes my job so much easier than the rest. Unlike certain hi-end strobe tuners it isn't TOO precise, just perfect.

The only con would be the display. The display fades out completely when looking at it from certain angles. It's not a huge problem but can be slightly annoying, particularly when using the tilt back legs and looking at the tuner from above. I really wish they had used a better display.

Apart from the display I have no complaints. I can honestly say I've never been happier with a tuner and it's not even particularly expensive.

Highly recommended!

I purchased this orchestral tuner to try tuning my upright piano. This Korg seemed to be the only option as I could find no alternative products in this class.
The reality is that the tuner presumably does its job reasonably well, although it does not detect sounds in the far bass and far treble octaves of the piano.
Also, I was quite utterly disappointed by the build quality of the device. It is made of cheap plastic and is very, very far from feeling "solid". All the switches and buttons are very wobbly and unpleasant to touch. Overall, it feels so much different from the sturdy construction of Korg's guitar tuner pedals.
Frankly speaking, it is a big disappointment.

I bought this tuner to use for tuning pianos. Korg claims that it has a detection range from 27-4186 Hz, which is completely untrue. The OT120 does NOT detect notes of neither the bottom two or top two octaves of a standard upright piano. I've tried to use it with 5 different pianos and it always has this problem.
So, don't buy it if you need to tune notes at 80 Hz or lower, or at 1500 Hz or higher.
But between (approximately) 80-1500 Hz, it works fine