(Before you go to the next paragraph you might like to know that the button to switch [Audio off ] is on the left hand (blue) side at the bottom.)
You might like to check out the metric converter at: http://metrication.com where you can try it out on-line or you can download it to your own computer for a small fee.
I am not recommending this as I haven't checked it out thoroughly but it might be adaptable for your needs.
Well, the music is irritating enough! As it converts both ways, I am not interested it linking to it.
Jim
