Reading are done with two, one was a strain gage 10-50 lb. and the K&M force indicator. We used the real strain gage to get a to see if the numbers on the K&M were close to accurate and they were. I was looking for numbers for reference the amount of force required to seat a bullet, and try to get uniform sets for record rounds. It also shows the amount of force it increased from one firing to the second and the third. This was only done on the 6mm cases....... jim