In the 25 years since I was regularly practicing with my flute, smartphones are here, and so are apps.
I got the Android app Soundcorset tuner and metronome.
I have an older electronic metronome, that also produces a 440A, but this app has other uses.
It will measure how close I am to 440, and show me if I'm a bit sharp or flat. BUT, even more, when I play a scale,
it will let me know how I'm doing for each note! This will really help me, as I know my notes were frequently a bit off in the past.
My long-ago teacher told me that one of her students had told her that she just "wanted to get good enough that she won't
have to practice anymore."
My teacher told her that won't happen. My teacher's instructor was principal flute for the Pittsburg Symphony, and every day, the first thing he did was to play scales, slowly, and optimize each note.
Well, I won't be doing that for an hour a day, but I will need to practice!