Daddario PW-CT-26 Rechargable USB Tuner

This tuner by D'Addario is very compact and lightweight. I like how it folds and turns into every possible angle. I own many (!) products by D'Addario and have never been disappointed by that brand. They just seem to make very good products.

As for the accuracy of the tuner I would say that it's very good. Then again, I use every tuner mainly to align my ukuleles with other instruments from the band. I believe, most instruments (guitars, ukuleles, etc.), no matter how poorly or well they are built, need to be tuned by ear in the end for best results. No tuner can replace the trained ear that knows the specific instrument and knows exactly which notes, overtones and harmonies need to align for the perfect tuning.

This is a fantastic tuner for a number of reasons.
-Charging capability just makes sense, no need to deal with annoying little batteries anymore.
-The battery lasts quite a while. I teach Guitar five days a week and use the tuner multiple times a day for myself and for most of my students and the battery will last for at least 4 weeks before even getting to the orange charge warning. Even then it will last for a week before it gets to the red.
-The clip has a two point swivel and a hinge to position the tuner practically any way you need to to get the best view.
-The LED lights are nice and bright, I haven't used the tuner in strong sunlight but I would imagine you would still be able to read the display.

The only one drawback of this tuner versus some others is that there are no preset modes for standard tunings on some popular instruments. Personally I never use those modes as the chromatic mode can do any tuning you want but some beginners find the preset tuning modes useful.