D'AddarioGuitar Tuner - NS Micro Soundhole Tuner - Fits in Guitar Sound Hole - For Acoustic Guitars, Ukuleles - Non Marring Sound Hole Clip - Quick & Accurate Tuning

I've purchased two of these now. I've checked them against Snark clip on tuners, the inbuilt tuner on my Valeton GP-200 multi-effects processor, a pitch app on my phone, and the ReaTune plugin for my DAW. They are more accurate than the Snark, and on equal level with effects processor. ReaTune and the app on my phone are more consistent and accurate with each other. I've been using the D'Addario tuners since I bought the first one months ago. I love having the tuner concealed in the sound hole, rather than sticking off the headstock. Also, the number of times I've sent a clipon tuner flying by bumping a wall, a person, a couch, a guitar stand, whatever... I'm happy to never have that issue again.

I bought the D'Addario NS Micro Sound Hole Tuner, hoping sound hole placement would be both convenient and stealthy. The tuner display and functions are similar to the NS Clip-on but with a clip optimized for sound holes. Like the headstock clip-on variant, you can leave it installed without worrying about it falling off or breaking.It’s powered by an exposed button cell so try not to sweat or spill beer on it! The NS seems delicate but is unlikely to suffer trauma since it’s inside the guitar. Installation is easy: simply side the clip onto the edge of the sound hole. Line it up carefully as it’s probably tough getting it out of the guitar should it fall in! Its easy to turn on with a left hand finger and easier to see than a headstock tuner. I also tried to install it in my tenor ukulele and that wasn't a good idea. After great struggle I got it mounted but then the sound hole is so small it was almost impossible to hit the on/off button with my finger. So out it came.Clipped on a Jose Ramirez classical guitar, I found it more responsive than the NS headstock Clip-on. However, I was getting misreads from the A-string: E instead of A. When I stopped the A-string from ringing, the NS displayed the ringing E harmonic from the low E! When I used my palm to mute the other open strings, there were no misreads. So apparently the NS is really sensitive as ringing harmonics set it off. No biggie once I found the workaround.All in all I loved the stealth and convenience of this small tuner. And the sound hole LCD is the most natural and easy to read place for a tuner.

The D'Addario PW-CT-15 tuner is barely noticeable on my guitar, so I leave it installed for immediate use any time. It works great, because it's easy to read from the player's position and is more accurate than a headstock tuner. My guitar sounds better than ever when I use this tuner.I'm glad I wasn't scared away by the negative reviews posted by some users. Here is my take on the issues they raised:(1) Guitars come in all shapes and sizes. This will fit most, but not all. Before buying the tuner, make sure that the clip will fit on the wood around your sound hole. For example, it might be too snug if you have an extra layer of reinforcing wood around the underside of your sound hole or a thick pick guard very close to the hole. A flat area up to 6/16" from the edge of the hole and up to 2/16" thick should be fine. Some reviewers reported that the clip was too loose for them, but the current model has a metal spring that should hold the tuner in place on thinner tops.(2) Guitars also have different bracing patterns. Make sure yours has room for the tuner between the hole and the bracing. You need space for the shape of a triangle with the corners cut off about 1-3/8" wide (accross the hole) and about 3/4" deep. For example, in the Taylor line, it fits my Grand Auditorium guitar with X bracing, but it might not fit in a GS Mini or anything with V-Class bracing. [UPDATE: I got a new guitar and can confirm that it works fine on a Taylor GA with V-Class bracing if you put it in the 7:00 position instead of 6:00. You can still reach the power button and see it fine.](3) Press the metal release tab to take the battery out without breaking the plastic tabs that also hold it in place. The manufacturer's video shows this clearly.(4) Install and remove the tuner carefully to avoid breaking the clip. This is easy to do, as shown in the manufacturer's video.For me, this is a fabulous upgrade at a very reasonable price.

The tuner works fine and provides the option to change the tuning frequency/pitch. Tuning is very easy and straightforward. I keep it in my guitar sound hole and is small enough to not affect playability and is not noticeable.The reason I deducted one star is because mine stopped working after just over a year so its durability is suspect.

This tuner is very inconspicuous in my concert ukulele. I have used two of the micro clip on NS tuner with our guitars and loved the performance for about a year. When I got a uke, I needed a dedicated tuner since I don't always play the instruments at the same time. I thought this may be better scaled with the smaller instrument and as good as the micro. I'm definitely not disappointed. It is easy for me to see, yet mostly Indetectable to others. The display is bright, which will help in low lighting. It's weight is negligible, but inside the instrument, it doesn't affect the balance as a headstock tuner might. It is easy to use, not confusing at all. I hope it holds up at the clip part and lasts.ETA: two weeks and it's going strong. I ordered a second for a sopranino uke!ETA2: clip still great a month in, while this tuner works well, I have noticed that if I'm percussive in my playing, or the uke gets tipped over while in it's case, that thi tuner slips off the lip of the sound hole and down into the body of my ukulele. I would not recommend for a child for this reason.