Iβve been using DβAddario NS Micro clip-on tuners on all of my ukuleles for a few years now because they are small enough to leave on the head stocks of my instruments without getting in the way of my playing or when the ukuleles are stored in their cases. DβAddario have a new version of the NS Micro tuner that clips to the sound hole of guitars, ukes and other acoustic instruments. The NS Micro Sound Hole Tuner is an accurate chromatic tuning device that uses vibration to read the stringβs pitch. This tuner features a non-marring clip and a backlit display that shows the pitch of the string when you pluck it. A small power button toggles power to the tuner which also automatically powers down after 10 minutes of inactivity. Priced at $19.95, the DβAddario NS Micro Sound Hole Tuner looks like a cool little tuner that doesnβt stick out on your head stock and is easy to see in all lighting conditions. You can find more info at the DβAddario site and order one through Amazon.