On Thu, 21 Feb 2019 08:16:01 -0000, Brian Gaff wrote:

Well I'd not go that far, but did you know that on different bits of the
earth the gravity can vary and hence no scale is going to be completely
accurate?

A balance scale will be the same, as the mass of each sides is equally
affected - that's where the beam balance is good.
When I was young (4 - 8 yo) my parents had a small shop; I found the beam
balance of great interest and very easy to use.
--
Peter.
The gods will stay away
whilst religions hold sway