TY - RPRT TI - NIST recommended practice guide : stopwatch and timer calibrations (2004 edition)/ AU - Graham, Robert M AU - Gust, Jeff C PY - 2004 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NBS SP 960-12e1 DO - 10.6028/NBS.SP.960-12e1 ER -