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"Audiovisual materials present all sorts of unique challenges to archivists.  Regardless of the archival function, many of these challenges require access to information about measurements, recording and playback speeds, and other technical aspects of the audiovisual formats in question.   You might have to calculate the playing time of a tape, or determine the length of the tape.  Different formats and standards might require a measurement conversion.Whatever the situation, you will likely find yourself looking for tools, guidelines, gauges, or calculators to help you along the way.  Luckily, there are some really helpful resources out there. ...."ArchivologySome useful hints!