I was just having a laugh with a near-retirement fitter only yesterday about this: digital calipers are not vernier calipers. From Wikipedia: A vernier scale,

I was just having a laugh with a near-retirement fitter only yesterday about this: digital calipers are not vernier calipers. From Wikipedia: A vernier scale, named after Pierre Vernier, is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation, thereby increasing resolution and reducing measurement uncertainty by using vernier acuity to reduce human estimation error.