Thanks for the info, here is a link to the one I was looking at
Buy Strain Gauges FORCE SENSOR I.E.E. SS-U-N-S-00015 online from RS for next day delivery.
If you click on the product info you will see where it mentions the pressure range.

Your explanation of how they are used cleared things up a lot for me, thanks


I probably wont bother with using anything like this, it had sparked my interest, however when I think how little I will need to use the force gauge I think the original design with the piston and pressure gauge will do all I need.

Hood