Vernier Calliper Vernier Calliper is a simple device to measure very small lengths easily. The movable scale, also known as Vernier scale, is divided into 10 units. If it slides along the main scale, marked in mm, the gap between two the 0s between the two scales. If the instrument is accurate, the two zeros must coincide. So, 10 Vernier units = 9 mm 1 Vernier unit = 9/10 mm 1 Vernier unit = 0.9 mm The gap between 1 unit of the main scale and Vernier unit = 1-0.9 = 0.1 mm With that, this particu