OMR answer sheets contain boxes, circles or elliptical bubbles where students or candidates mark using a 2B pencil or a #2 pencil. OMR scanner reads specific locations of answer sheets and converts their information into data.

OMR scanner requires a higher positioning accuracy answer sheet. The paper used as answer sheet should have uniform thickness, good stiffness and smooth surface and high cutting accuracy. only the conditions above are satisfied, double sheets or sheet jam will not happen during reading.