jobo
Grandmaster
well clearly it doesnt, as its giving you the answer in non existent units of force,LOL, I've learned to be patient with you because, well, you're just different.
But there are machines for this. County fairs typically have them, and many sports bars have them. If you go to Dave & Buster's, or places similar to that (I don't know what you have in the UK), you'll definitely find them there.
Anyhow, the machine has a padded scale that you punch, and it measures the force.
I'm not sure fair ground amusment equipment counts as a measure of anything apart from ego and gullibility