Thank you to all who replied. Now that I know the answer, it seems so obvious!
Spacedeck and stylus force guage
I am setting up a Nottingham Spacedeck with Spacearm I recently bought used. The instructions with the Spacedeck say to use scales directly on the mat. The instructions with my Shure SFG-2 stylus force guage say to place it on a record. This will result in a huge differance in pressure. Which is correct?