I use this for tuning everything. It's really accurate.Peterson strobe tuner for iOS
This is what I've been thinking about. See the "Tonic, Subdominant and Dominant Harmony" thread about tuning and temperament.Since what we hear as in tune or out of tune is based on how simultaneously sounding tones are getting along together in the room we are in, it is best to practice with other reference tones (that are known to be in tune) are sounding. This way we can both hear and feel what being in tune is. I find that visual tuners are of very limited use for learning to play in tune.
Thanks for that. I'm going to try it later.I use this free tanpura online while practicing:
This gives a nice "dominant, tonic, tonic, tonic an octave lower" 4 note pattern rich with overtones that repeats and can be set on any of the twelve chromatic tones. I can tune any tones in the selected key including any chords that might be encountered in those keys.