If you are in Drop C and wish to tune up to Drop D, you don’t need to readjust the strings. All you gotta do is put a capo on the 2nd fret, you’ll have Drop D.
With the Roadie Tuner, your set-list is sure to flow naturally. It comes with an extensive index of 150+ built-in tunings so you don't need to worry about switching between different alternate tunings and keeping track of your custom ones. All you need to do is select your tuning of choice, place Roadie on the peg and watch it automatically tune your instrument for you in just seconds.