)×1=0.1mm=0.01cm Here 7th division of vernier scale coincides with a division of main scale and the zero of vernier scale is lying right side of the zero of main scale. Zero error = 7 × 0.1 = 0.7 mm = 0.07 cm. Length of the cylinder = measured value – zero error = (3.1 + 4 × 0.01) – 0.07 = 3.07 cm.