String #1-E3 2-G3 3-A3 4-C4 5-D4 6-E4 7-G4 8-A4 9-C5 10-D5 11-E5 12-G5 13-A5 14-C6 15-D6 16-E6 17-G7
Using your phone with Ninja Tuner browser (free)
This works well if you tune one instrument at a time.
Using a physical tuner (provided during group class for in-class use)
This works well if you are in a place with noises or someone else is also tuning nearby.