Check out the bottom readings in the picture: those are contractions. See those plateau mountains? That’s because they’re SO HUGE that the max out the reading! They’re reading over 100! My wife is off the chart on the contract-o-meter!
DISCLAIMER: i have no idea what this actually means. My invented “off the charts” explanation sounded plausable to me and it reinforces my opinion that MY WIFE IS SUPER-HUMAN(!) and so I’m sticking with it.