Well... I have some digital scales for checking my weed that weighs to 0.1g... they're not very accurate because it weighs a 2p at 7.1g (I know it's 7g because I'm a stoner and 2p coins are regularly used to weigh a quarter of an ounce).

A ten pence is coming up 6.6g.

My silver 2p is... drumroll please... 6.6g.

I think I'm just going to send it to the Mint for analysis, based on that alone. My scales are accurate enough to tell me that it is approximately the same weight as a 10p, not 2p. I can't be fucked to create a water scale when I have dodgy Chinese import digis telling me what I wanted to see.