• Ruler body material: plastic carbon fiber ruler
• Battery Model: LR44 / SR44 / AG13 1.5V
• Table material: plastic ABS
• Range: 0-150mm
• Resolution: 0.1mm / 0.01in

The vernier caliper's main ruler and cursor have two pairs of movable jaws, which are the inner and outer measuring jaws. The inner measuring jaws are usually used to measure the inner diameter. The outer measuring jaws are usually used to measure the length and outer diameter.

Caliper in the measurement, the first hand to rub a rub the inner side of the amount of claws, and then zero, that is, the amount of claws to be closed, and depends on the main ruler, ruler on the two 0 is aligned. Some businesses calipers will be deviated from the scale 0 on the ruler in the main ruler 0 tick left, then the amount out of the size is too small, and vice versa.