I usually ask for these for birthdays and Christmas for my ever growing guitar/bass collection, instead of aftershave and whatnot. They are accurate, tiny, and stay on my guitars and basses in gig bags without coming loose. You can reverse the readout for use under or over the headstock. They are a step slower and harder to see than the chromatic Snark I have for my autoharp, but maybe I'm just more patient than I used to be. I'm better at tuning by ear now, but love ALWAYS having one handy to be dead accurate when playing with others. I am almost to the point of having one on all my instruments with Santa's delivery of this double NS Micro pack in 2017. Though I'm a true believer in these things, they have been out long enough that I've had to change a few batteries (CR2032). That is forever in the electronics world and faster tracking, brighter readout NS Micros should have been released by now. If Snark ever releases a tuner this small, they'll take the NS Micro's market overnight.