For calipers calibrated in inches it's 0.001" (a "thou"). Not sure about metric verniers - I think it's typically 0.05mm. Note (as it often catches people out). A caliper is a vernier caliper only if it has a vernier scale, i.e. a secondary scale so calibrated that is has a magnifying effect. A caliper fitted with a digital read-out is not a "vernier caliper".
The vernier caliper is more accurate that a plastic ruler. That's because the caliper is designed to be used and effectively read to measure small distances. And it does this better than a "regular" ruler because it has a vernier scale built into it. It's like an "amplified ruler" attached to the device that has increased accuracy. A link is provided to the Wikipedia article on the vernier caliper and to the one on the…
If a vernier caliper has zero reading of 0.025 cm and the caliper reads 5.565 cm what should be the correct reading?
If a vernier caliper has zero reading of 0.025 cm and the caliper reads 5.565 cm what should be the correct reading? 5.565 - 0.025 = 5.54 so caliper reads 5.54 cm If the zero reading on the vernier calipers is -0.025 cm with the reading still 5.565cm, it is 5.565 - (-0.025) = 5.565 + 0.025 = 5.59 cm