These values work for tuning a guitar or any other instrument correctly, to C=256 Hz, A=432 Hz. This is also called the "Verdi tuning" sometimes, though it really relates to Pythagorean tuning.

A0=215 Hz
Bb0=228.6 Hz
B0=242.5 Hz
C1=256.0 Hz
C#1=271.5 Hz
D1=287.8 Hz
D#1=305.2 Hz
E1=323.7 Hz
F1=341.7 Hz
F#1=362.4 Hz
G1=384.3 Hz
G#1=407.4 Hz
A1=432 Hz
Bb1=458.2 Hz
B1=485.9 Hz
C2=512 Hz

Graham Jackson advises on how to tune a piano:

"For the “twelve true-5ths tuning”: you first set C at 256 Hz. Then you tune the 7 “white keys” by the circle of 5ths, using however natural 5ths. Then you divide the octave at C exactly in half (which can be done handily with a special tuning fork), and tune the 5 “black keys” by natural 5ths to that F#. You end up with two series of natural 5ths – one of 7 notes and one of 5 notes, linked by an “unnatural” interval of an augmented 4th (which is actually the same augmented 4th found in the equal-tempered system)."

What's needed for tuning an electric guitar is either a tuner that can read Hz values, or a sound interface with an electric guitar socket. A guitar could also be plugged into a mixer and from there patched to a sound interface. Any DAW with VST support (like REAPER, which is shareware) and a frequency analyser plugin (like Freakoscope - recommended) will do to tune the guitar, and it can be tuned by base string values with harmonic values too, e. g. if the fundamental note from the list is too low (like on a bass guitar), use the closest harmonic value in Hz to tune.

As a rule, never, ever tune above 439, or even 438 Hz, as it will create a metallic/uncertainty harshness in music. The A=440 Hz standard is an abomination. The old French standard is 435 Hz, Mozart, Verdi, Beethoven, most of the classical composers all tuned to A=432 Hz, C=256 Hz, or close (A=435 Hz, etc.). Jimi Hendrix and Bob Marley are just a couple famous modern musicians who tuned to A=432 Hz. You won't ever get that "Marley vibe" by playing in A=440 Hz. So ditch those modern electronic preset tuners and tune to the right values.

Software synthesisers can be tuned with Microtuner and the Scala Real Equal Temperament file. Just load the file into Microtuner at the beginning of the stack, before the synth plugin. Microtuner must be the first plugin on the stack, before a synthesiser plugin.

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