Thanks for the advice - I should have mine by mid-week....great tips!
My best advice is to get an electronic tuner. It will make tuning your Bowed Psaltery so much easier.
I've put an article online on how to tune a Bowed Psaltery. This may be helpful.
I like your idea of incorporating a metronome into something you're already carrying.
For a metronome, Steinway Pianos created a free app for the iPhone & iPad.
It's easy to use (can use earplugs). You can even tap a beat & it will tell you what the beat is and set to that. This was very helpful to me at the BP Symphony practices.
So if you already have an iPhone or iPad, check it out.