... for reading lotto tickets,answer sheets, or other OMR marks sheets 2, small and portable, only 0.8kg weight 3, ... :≤1×10-4Power input:DC 12V,1.5AInterfaceUSB or DB9(RS232 protocol)Operating system:Windows 98/XP ... signing pen or ball point pen A portable optical mark reader (or named: OMR scanner), small volume and be portable, or easy ... entry, statistics and analysis is required. portable OMR card reader