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...Oklahoma department of transportation standard operating procedures sop date issued dated revised page created by donald mccullough approved michael groom timer nist special publication purpose this procedure provides instructions for verifying the accuracy general timers equipment required tolerance shall meet requirements less than or equal to seconds in hours that is specified paragraph a note if device being tested does not indicate tenths hundredths second place zero appropriate box calibration form verification single count up simultaneously start and be verified allow run minimum then stop record displayed time from each e g minutes hundredth space on report multiple devices interval between starting stopping consecutive may changed operator st nd rd example started at minute etc you must leave enough data before next should both when displays five as repeat step remainder adding intervals shown below until all are ten b th fifteen c twenty reaches three running finished continu...