Chromatic Watch Tuner App Reviews

I tune my instrument to A441. How do I adjust the setting on my watch?

Edit: App installs on phone and seems to work but doesn’t show up as available for the watch. I had to reboot the phone and then the app automatically synced to the watch. There’s no how-to. First attempts at tuning - it’s pretty accurate compared to pitch lab. For an upright bass it’s not great with the E string. Will try it on a few more instruments.