Disklavier

I have read that the recommended humidity for a piano is 42%

My DC1A just arrived into my home last week on Wednesday evening, and after
measuring the humidity in the room I am a bit concerned.  The level doesn't
even read on the digital readout - it just reads 'L' for low.  I think it
must be below 10%.

How soon should I try to get a humidifier installed without doing any damage
to the piano?  I am leaning toward getting a whole-house type like
Aprilaire, but if I should get a room unit in there pronto to avoid damage,
I will go buy one.

Your advice is appreciated!

John W. Gewartowski 
Sr. Product Support Engineer, Product Technical Services 
Tyco Healthcare Retail Group 
610-878-3423