Old meters

Where do your old meters go when you upgrade - is there a charity that wants them?

I have just been given an ultrasmart (love it!! ) and I am keeping my old breeze as an emergency spare as I still have an unopened strip tub. Hiwever I also have another meter that I got free (I think it is a freestyle?) and I want to find it a good home but can't seem to find one.

What do you do with yours once they are upgraded?

Thanks

Louise