In the world of tactile pressure sensors, you’re often only as good as what you’re able to demonstrate. As such, calibrating pressure sensors is a crucially important process.
In a perfect universe, all sensors would have the exact same reaction to a given input. When the input is, say, 1 psi, every sensor element would produce the same number of counts in response. Unfortunately, manufacturing variations and various control issues mean nothing is ever really identical. For example, 1 psi might produce an output of 1,000 counts in one element and 990 in another. To account for these disparities and attain a truly accurate pressure reading, it’s thus often necessary to calibrate.