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Paper charts are the only acceptable documentation of the manufacturing process's quality. In many instances, quality assurance managers and auditors accept a pen trace against a trend grid on paper as the only method of certifying the temperature, pressure, and other process variables that are essential to a product's quality and safety. The technology of precise process signal monitoring and printing out a chart that trends the data against time has been perfected by chart recorder yokogawa. The chemistry of the ink pens, the design of the analogue signal measuring circuit, the servo pen drive, and the secret formula for the chart paper are just a few examples of the art and science at work here.