This tuner is extremely precise. It also has a couple of great features, like a dynamic noise filter that will take a sample of background noises and digitally filter them out, and a volume boost to get a better audio signal for softer sounds. I actually use it on Ipad to adjust and calibrate Vintage analog synthesizer oscillators, and can actually see their extremely small pitch variations in real time! Does the job of a professional hardware tuner for a fraction of the cost (if you dont count in the price of the Ipod, or worst the Ipad).