Hi! You have found the best way to tune the guitar πΈ! Use this tuner - it works via microphone π€. The tuner is suitable for acoustic and electric guitar.
Just turn on the tuner and allow access to the microphone. Play the sound and look what tuner shows.
How to tune Drop D: tune the first 5 strings as in the standard tuning, then tune the 6-th string one tone below standard, from E to D.
Thank you for visiting and have a nice day! πΈ Source: Guitar Tuner