Tube

Yup, tube - lurking down the bottom right hand corner.
Ever seen a tube like that and wondered what on earth?

Probably not, as part of the idea (with ours at least) is that curious eyes don't turn into curious hands! It means that when I'm doing the rounds on replacing them each month I need to take our specially converted litter picker and my tallest shoes.

Anyway, they're supposed to monitor the levels of No2 in the air, and this one's probably on the cleanest/quietest street (a private, dead end road, with no tarmac) that we report on. Yes - big, big houses there...