rowuk

I do not like the tuner except to get an ensemble tuned up. The fastest and best way to learn to play in tune is ensemble or duets with somebody better than you.
Keyboards have fixed intonation for each note. That well-temperedness is a compromise. We have to know where to place the notes depending on the key we are playing in. Tuners will slow our progress down!
To learn how to play in tune alone, the best method that I have experienced is to find some constant tone like from a keyboard or computer and then play scales against that tone. Especially 3rds, 4ths, 5ths and 7ths are easy to hear.

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Whenever I feel blue, I start breathing again.