... °C~50°C,Humidity: 35%~95%, no erosive gas* Form designed standard:Form’s width:79mm=3.11inForm’s length:≤300mm≤11 ... .21inLine space:3~12mm=0.12~0.47inData capacity:≤13 data columns≤75 linesMarking tools:black/dark blue color pencil, pen ... , educational evaluations, staff examination, and at anywhere large amounts of data entry, statistics and analysis is required. portable OMR card reader