Stumbled upon this grade master that grades scantrons : r/mildlyinteresting
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iNSIGHT 4ES OMR and Image Scanner | Trust the Scantron family of high precision data collection tools, with their proven OMR and image capture features, to meet your data management needs....
Scantron Test Scanning - TCU Information Technology
Scantron+888P+Test+Scoring+Machine+T147356 for sale online | eBay