BLUEMOMENT

I'm sure you are aware of probably the most common use for these scales.

The £1 coin has a mass of 9.5 g; the £2 coin has 12 g, and the 50p has 8 g.

So it will cost you £17.50 to weigh your Co2 cartridge


EDIT. I have just found that a 20p is 5g exactamento