Because of their accuracy, some strobe tuners enable you to experiment with sweetened tunings. Let’s explain. Most modern Western scales and tuning standards use equal temperament, which means that an octave is equally divided into 12 notes. It works well enough and is mathematically convenient, but it’s not strictly correct. For reasons too complicated to go into here, it’s a compromise.
Similarly, on a stringed instrument such as a guitar, some fretted notes will be very slightly out of tune, even if it’s correctly set up and well intonated. Sweetened tuning attempts to rectify these problems by slightly adjusting the space between each interval. They’ll no longer be equally spaced, but dyads and chords should sound better, or sweeter, in some circumstances.
There is, however, always a trade-off. Although certain chords or harmonies played on a particular section of the neck will sound better, others may sound worse. Tuner developers overcome this by providing scores of sweetened tunings for different instruments, open notes, musical genres, and so on. This enables you to chop and change tunings to best suit the piece you are currently playing.