Digital vernier calipers can:

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Digital vernier calipers are designed for measurement versatility. They can switch between metric and imperial units, so you can read in millimeters or inches without converting. They also let you find the difference between two measurements using the zeroing feature: measure a first length, set the display to zero at that point, then measure a second length—the display shows the difference between the two. Being able to zero anywhere within the range means you can establish a reference point at any position along the scale, which is essential for relative or comparative measurements. These capabilities are what make digital calipers more flexible than tools that don’t offer unit switching, subtraction via zeroing, or flexible zeroing. They do not automatically calibrate themselves, and while some models can show fractional inches, that isn’t a universal or guaranteed feature.