It's tiny and beautiful. I thought this would fit and stay on me pedalboard for ages. If you play at 440 Hz, this is tuner to go.
I found (only too late, should have read the manual before) that the reference pitch can not be changed. When playing with violinists they often prefer 442 Hz. So: End of a promising pedalboard love story.
Another con: As far as I'm concerned this is not a chromatic tuner.